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Hard Wear-Resistant 52100 Alloy Steel Balls
- Yield Strength: 295,000 psi
- Hardness: Rockwell C60 (Very Hard)
- Specifications Met: See table
Also known as chrome steel, 52100 is an extremely hard and wear-resistant material. These balls are often used in bearings.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
| Dia. | Dia. Tolerance | Heat Treatment | Specifications Met | Pkg. Qty. | Pkg. | |
Mirror-Like | ||||||
|---|---|---|---|---|---|---|
| 0.026" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 500 | 00000000 | 000000 |
| 1/32" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 500 | 00000000 | 00000 |
| 0.043" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 3/64" | -0.0001" to 0.0001" | Hardened | __ | 100 | 00000000 | 00000 |
| 0.0512" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.0565" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.058" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 1/16" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 0.0656" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.072" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.0761" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 5/64" | -0.0001" to 0.0001" | Hardened | __ | 100 | 00000000 | 00000 |
| 0.0833" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 0000000 | 0000 |
| 0.09" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 3/32" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 0.0953" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.0975" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.0981" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.101" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 7/64" | -0.0001" to 0.0001" | Hardened | __ | 100 | 00000000 | 00000 |
| 1/8" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 0.1292" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.1345" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 0.137" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 0000 |
| 9/64" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 5/32" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 11/64" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 3/16" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 0.194" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 00000 |
| 7/32" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 0.2372" | -0.0001" to 0.0001" | Hardened | ASTM A295 | 100 | 00000000 | 00000 |
| 1/4" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 17/64" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 00000 |
| 9/32" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 5/16" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 0000 |
| 11/32" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 00000 |
| 3/8" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 00000 |
| 13/32" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 00000 |
| 7/16" | -0.0001" to 0.0001" | Hardened | __ | 100 | 0000000 | 00000 |
| 15/32" | -0.0001" to 0.0001" | Hardened | __ | 50 | 0000000 | 00000 |
| 1/2" | -0.0001" to 0.0001" | Hardened | __ | 50 | 0000000 | 00000 |
| 17/32" | -0.0001" to 0.0001" | Hardened | __ | 50 | 0000000 | 00000 |
| 9/16" | -0.0001" to 0.0001" | Hardened | __ | 50 | 0000000 | 00000 |
| 19/32" | -0.0001" to 0.0001" | Hardened | __ | 25 | 0000000 | 00000 |
| 5/8" | -0.0001" to 0.0001" | Hardened | __ | 25 | 0000000 | 00000 |
| 21/32" | -0.0001" to 0.0001" | Hardened | __ | 25 | 0000000 | 00000 |
| 11/16" | -0.0001" to 0.0001" | Hardened | __ | 25 | 0000000 | 00000 |
| 23/32" | -0.0001" to 0.0001" | Hardened | __ | 25 | 0000000 | 00000 |
| 3/4" | -0.0001" to 0.0001" | Hardened | __ | 25 | 0000000 | 00000 |
| 25/32" | -0.0001" to 0.0001" | Hardened | __ | 10 | 0000000 | 0000 |
| 13/16" | -0.0001" to 0.0001" | Hardened | __ | 20 | 0000000 | 00000 |
| 7/8" | -0.0001" to 0.0001" | Hardened | __ | 10 | 0000000 | 00000 |
| 15/16" | -0.0001" to 0.0001" | Hardened | __ | 10 | 0000000 | 00000 |
| 1" | -0.0001" to 0.0001" | Hardened | __ | 5 | 0000000 | 00000 |
| 1 1/16" | -0.0001" to 0.0001" | Hardened | __ | 5 | 0000000 | 00000 |
| 1 1/8" | -0.0001" to 0.0001" | Hardened | __ | 5 | 0000000 | 00000 |
| 1 3/16" | -0.0001" to 0.0001" | Hardened | __ | 1 | 0000000 | 0000 |
| 1 1/4" | -0.0001" to 0.0001" | Hardened | __ | 1 | 0000000 | 0000 |
| 1 5/16" | -0.0001" to 0.0001" | Hardened | __ | 4 | 0000000 | 00000 |
| 1 3/8" | -0.0001" to 0.0001" | Hardened | __ | 1 | 0000000 | 0000 |
| 1 7/16" | -0.0001" to 0.0001" | Hardened | __ | 2 | 0000000 | 00000 |
| 1 1/2" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 0000 |
| 1 9/16" | -0.0002" to 0.0002" | Hardened | __ | 1 | 00000000 | 00000 |
| 1 5/8" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 00000 |
| 1 11/16" | -0.0002" to 0.0002" | Hardened | __ | 1 | 00000000 | 00000 |
| 1 3/4" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 00000 |
| 1 7/8" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 00000 |
| 2" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 00000 |
| 2 1/8" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 00000 |
| 2 1/4" | -0.0005" to 0.0005" | Hardened | __ | 1 | 0000000 | 00000 |
| 2 3/8" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 000000 |
| 2 1/2" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 000000 |
| 2 5/8" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 000000 |
| 2 3/4" | -0.0002" to 0.0002" | Hardened | __ | 1 | 0000000 | 000000 |
| 3" | -0.0005" to 0.0005" | Hardened | __ | 1 | 0000000 | 000000 |
| 3 1/4" | -0.0005" to 0.0005" | Hardened | __ | 1 | 00000000 | 000000 |
| 3 1/2" | -0.0005" to 0.0005" | Hardened | __ | 1 | 00000000 | 000000 |
| 4" | -0.0005" to 0.0005" | Hardened | __ | 1 | 00000000 | 000000 |
| 4 1/2" | -0.003" to 0.003" | Hardened | __ | 1 | 00000000 | 000000 |
| 1mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 1.5mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 2mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 2.5mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 3mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 3.5mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 4mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 4.5mm | -0.0025mm to 0.0025mm | Hardened | __ | 50 | 0000000 | 0000 |
| 5mm | -0.0025mm to 0.0025mm | Hardened | __ | 100 | 0000000 | 0000 |
| 5.5mm | -0.0025mm to 0.0025mm | Hardened | __ | 50 | 0000000 | 0000 |
| 6mm | -0.0025mm to 0.0025mm | Hardened | __ | 50 | 0000000 | 0000 |
| 6.5mm | -0.0025mm to 0.0025mm | Hardened | __ | 50 | 0000000 | 0000 |
| 7mm | -0.0025mm to 0.0025mm | Hardened | __ | 50 | 0000000 | 0000 |
| 8mm | -0.0025mm to 0.0025mm | Hardened | __ | 25 | 0000000 | 0000 |
| 9mm | -0.0025mm to 0.0025mm | Hardened | __ | 20 | 0000000 | 0000 |
| 10mm | -0.0025mm to 0.0025mm | Hardened | __ | 20 | 0000000 | 0000 |
| 12mm | -0.0025mm to 0.0025mm | Hardened | __ | 10 | 0000000 | 0000 |
| 13mm | -0.0025mm to 0.0025mm | Hardened | __ | 5 | 0000000 | 0000 |
| 14mm | -0.0025mm to 0.0025mm | Hardened | __ | 5 | 0000000 | 0000 |
| 15mm | -0.0025mm to 0.0025mm | Hardened | __ | 5 | 0000000 | 0000 |
| 16mm | -0.0025mm to 0.0025mm | Hardened | __ | 5 | 0000000 | 0000 |
| 18mm | -0.0025mm to 0.0025mm | Hardened | __ | 3 | 0000000 | 0000 |
| 24mm | -0.0025mm to 0.0025mm | Hardened | __ | 3 | 0000000 | 00000 |
Tight-Tolerance Hard Wear-Resistant 52100 Alloy Steel Balls
- Yield Strength: 295,000 psi
- Hardness: Rockwell C60 (Very Hard)
- Specifications Met: ASTM A295
The diameter on these balls is held to a precise tolerance. Also known as chrome steel, 52100 is an extremely hard and wear-resistant material. These balls are often used in bearings.
For technical drawings and 3-D models, click on a part number.
| Dia. | Dia. Tolerance | Heat Treatment | Pkg. Qty. | Pkg. | |
Mirror-Like | |||||
|---|---|---|---|---|---|
| 1/16" | -0.00005" to 0.00005" | Hardened | 5 | 00000000 | 00000 |
| 1/8" | -0.00005" to 0.00005" | Hardened | 5 | 0000000 | 0000 |
| 9/64" | -0.00005" to 0.00005" | Hardened | 5 | 0000000 | 0000 |
| 5/32" | -0.00005" to 0.00005" | Hardened | 5 | 0000000 | 0000 |
| 3/16" | -0.00005" to 0.00005" | Hardened | 5 | 0000000 | 0000 |
| 7/32" | -0.00005" to 0.00005" | Hardened | 5 | 0000000 | 00000 |
| 1/4" | -0.00005" to 0.00005" | Hardened | 2 | 0000000 | 0000 |
| 9/32" | -0.00005" to 0.00005" | Hardened | 2 | 0000000 | 0000 |
| 5/16" | -0.00005" to 0.00005" | Hardened | 2 | 0000000 | 0000 |
| 3/8" | -0.00005" to 0.00005" | Hardened | 2 | 0000000 | 0000 |
| 7/16" | -0.00005" to 0.00005" | Hardened | 1 | 0000000 | 0000 |
| 15/32" | -0.00005" to 0.00005" | Hardened | 1 | 0000000 | 0000 |
| 1/2" | -0.00005" to 0.00005" | Hardened | 1 | 0000000 | 0000 |
| 17/32" | -0.00005" to 0.00005" | Hardened | 1 | 0000000 | 00000 |
Low-Carbon Steel Balls
- Yield Strength: 44,000 psi
- Hardness: Rockwell C60 (Very Hard)
Low-carbon steel balls are our easiest steel balls to machine. They are often used for parts that don’t require high strength, such as knobs. These balls can be surface hardened with heat treating for added wear resistance.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
| Dia. | Dia. Tolerance | Heat Treatment | Mechanical Finish | Pkg. Qty. | Pkg. | |
Mirror-Like | ||||||
|---|---|---|---|---|---|---|
| 1/16" | -0.005" to 0.005" | Case Hardened | Tumbled | 500 | 00000000 | 00000 |
| 3/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 500 | 00000000 | 0000 |
| 7/64" | -0.005" to 0.005" | Case Hardened | Tumbled | 1,000 | 000000000 | 00000 |
| 1/8" | -0.005" to 0.005" | Case Hardened | Tumbled | 500 | 00000000 | 0000 |
| 9/64" | -0.005" to 0.005" | Case Hardened | Tumbled | 1,000 | 000000000 | 00000 |
| 5/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 500 | 00000000 | 0000 |
| 11/64" | -0.005" to 0.005" | Case Hardened | Tumbled | 750 | 000000000 | 00000 |
| 3/16" | -0.005" to 0.005" | Case Hardened | Tumbled | 250 | 00000000 | 0000 |
| 7/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 250 | 00000000 | 0000 |
| 1/4" | -0.005" to 0.005" | Case Hardened | Tumbled | 250 | 00000000 | 0000 |
| 17/64" | -0.005" to 0.005" | Case Hardened | Tumbled | 500 | 000000000 | 00000 |
| 9/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 250 | 00000000 | 00000 |
| 5/16" | -0.005" to 0.005" | Case Hardened | Tumbled | 250 | 00000000 | 0000 |
| 11/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 100 | 00000000 | 0000 |
| 3/8" | -0.005" to 0.005" | Case Hardened | Tumbled | 250 | 00000000 | 00000 |
| 13/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 100 | 000000000 | 00000 |
| 7/16" | -0.005" to 0.005" | Case Hardened | Tumbled | 100 | 00000000 | 0000 |
| 15/32" | -0.005" to 0.005" | Case Hardened | Tumbled | 100 | 000000000 | 00000 |
| 1/2" | -0.005" to 0.005" | Case Hardened | Tumbled | 100 | 00000000 | 00000 |
| 9/16" | -0.005" to 0.005" | Case Hardened | Tumbled | 100 | 00000000 | 00000 |
| 5/8" | -0.005" to 0.005" | Case Hardened | Tumbled | 50 | 00000000 | 00000 |
| 11/16" | -0.005" to 0.005" | Case Hardened | Tumbled | 25 | 000000000 | 00000 |
| 3/4" | -0.005" to 0.005" | Case Hardened | Tumbled | 25 | 00000000 | 00000 |
| 7/8" | -0.005" to 0.005" | Case Hardened | Tumbled | 20 | 00000000 | 00000 |
| 1" | -0.005" to 0.005" | Case Hardened | Tumbled | 10 | 00000000 | 00000 |
| 1 1/4" | -0.005" to 0.005" | Case Hardened | Tumbled | 5 | 000000000 | 00000 |
| 1 1/2" | -0.005" to 0.005" | Case Hardened | Tumbled | 5 | 000000000 | 00000 |
| 2" | -0.005" to 0.005" | Case Hardened | Tumbled | 1 | 000000000 | 00000 |
| 1mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,500 | 000000000 | 00000 |
| 1.5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,500 | 000000000 | 00000 |
| 2mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,500 | 000000000 | 00000 |
| 2.5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,500 | 000000000 | 00000 |
| 3mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,000 | 000000000 | 00000 |
| 3.5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,000 | 000000000 | 00000 |
| 4mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 1,000 | 000000000 | 00000 |
| 4.5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 500 | 000000000 | 00000 |
| 5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 500 | 000000000 | 00000 |
| 5.5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 500 | 000000000 | 00000 |
| 6mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 250 | 000000000 | 00000 |
| 6.5mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 250 | 000000000 | 00000 |
| 7mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 250 | 000000000 | 00000 |
| 8mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 250 | 000000000 | 00000 |
| 9mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 250 | 000000000 | 00000 |
| 10mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 100 | 000000000 | 00000 |
| 12mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 50 | 000000000 | 00000 |
| 13mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 100 | 000000000 | 00000 |
| 14mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 100 | 000000000 | 00000 |
| 15mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 50 | 000000000 | 00000 |
| 16mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 50 | 000000000 | 00000 |
| 18mm | -0.13mm to 0.13mm | Case Hardened | Tumbled | 25 | 000000000 | 00000 |
Hardened Shock-Resistant S2 Tool Steel
- Yield Strength: 290,000 psi
- Hardness: Rockwell C55 (Very Hard)
- Specifications Met: ASTM A681
This S2 tool steel has been hardened for excellent strength and impact resistance. It has a tough core that resists breaking under shock loads.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
| Dia. | Dia. Tolerance | Mechanical Finish | Pkg. Qty. | Pkg. | |
Mirror-Like | |||||
|---|---|---|---|---|---|
| 3/16" | -0.001" to 0.001" | Ground and Polished | 100 | 0000000 | 00000 |
| 1/4" | -0.001" to 0.001" | Ground and Polished | 100 | 0000000 | 0000 |
| 5/16" | -0.001" to 0.001" | Ground and Polished | 100 | 0000000 | 00000 |
| 7/16" | -0.001" to 0.001" | Ground and Polished | 50 | 0000000 | 00000 |
| 1/2" | -0.001" to 0.001" | Ground and Polished | 50 | 0000000 | 00000 |
| 3/4" | -0.001" to 0.001" | Ground and Polished | 10 | 0000000 | 0000 |
| 13/16" | -0.001" to 0.001" | Ground and Polished | 10 | 0000000 | 00000 |
| 7/8" | -0.001" to 0.001" | Ground and Polished | 10 | 0000000 | 00000 |
| 15/16" | -0.001" to 0.001" | Ground and Polished | 10 | 0000000 | 00000 |
| 1" | -0.001" to 0.001" | Ground and Polished | 5 | 0000000 | 00000 |
Ball Bore Gauge Sets
Keep over two dozen different ball diameters on hand to check bore sizes or use as go/no-go gauges. For accuracy, they’re precision ground to tight tolerances. These sets include two balls for each diameter, so you can cross-check accuracy, measure multiple spots at the same time, or swap them out after they wear. They're often used to test engine cylinders, machine components, and turbines where deviations in roundness or size can lead to wear. You can also use them to find the taper of a bore or the diameter of a countersunk hole.
To find your bore’s ID, set a ball that’s slightly smaller than your bore into the hole. With a measuring tool, determine how big the gap is between the ball and the edge of the hole. Add that measurement to the ball’s diameter to calculate the ID.
| Measuring Range | Material | Number of Gauges | Includes | Each | |
| 0.125"-1" | Steel | 52 | Two 0.125" Dia. Ball Bore Gauges Two 0.141" Dia. Ball Bore Gauges Two 0.156" Dia. Ball Bore Gauges Two 0.188" Dia. Ball Bore Gauges Two 0.219" Dia. Ball Bore Gauges Two 0.250" Dia. Ball Bore Gauges Two 0.281" Dia. Ball Bore Gauges Two 0.313" Dia. Ball Bore Gauges Two 0.344" Dia. Ball Bore Gauges Two 0.375" Dia. Ball Bore Gauges Two 0.406" Dia. Ball Bore Gauges Two 0.438" Dia. Ball Bore Gauges Two 0.469" Dia. Ball Bore Gauges Two 0.500" Dia. Ball Bore Gauges Two 0.531" Dia. Ball Bore Gauges Two 0.563" Dia. Ball Bore Gauges Two 0.594" Dia. Ball Bore Gauges Two 0.625" Dia. Ball Bore Gauges Two 0.656" Dia. Ball Bore Gauges Two 0.688" Dia. Ball Bore Gauges Two 0.719" Dia. Ball Bore Gauges Two 0.750" Dia. Ball Bore Gauges Two 0.813" Dia. Ball Bore Gauges Two 0.875" Dia. Ball Bore Gauges Two 0.938" Dia. Ball Bore Gauges Two 1.000" Dia. Ball Bore Gauges | 0000000 | 000000 |
| 1mm-25mm | Steel | 50 | Two 1 mm Dia. Ball Bore Gauges Two 2 mm Dia. Ball Bore Gauges Two 3 mm Dia. Ball Bore Gauges Two 4 mm Dia. Ball Bore Gauges Two 5 mm Dia. Ball Bore Gauges Two 6 mm Dia. Ball Bore Gauges Two 7 mm Dia. Ball Bore Gauges Two 8 mm Dia. Ball Bore Gauges Two 9 mm Dia. Ball Bore Gauges Two 10 mm Dia. Ball Bore Gauges Two 11 mm Dia. Ball Bore Gauges Two 12 mm Dia. Ball Bore Gauges Two 13 mm Dia. Ball Bore Gauges Two 14 mm Dia. Ball Bore Gauges Two 15 mm Dia. Ball Bore Gauges Two 16 mm Dia. Ball Bore Gauges Two 17 mm Dia. Ball Bore Gauges Two 18 mm Dia. Ball Bore Gauges Two 19 mm Dia. Ball Bore Gauges Two 20 mm Dia. Ball Bore Gauges Two 21 mm Dia. Ball Bore Gauges Two 22 mm Dia. Ball Bore Gauges Two 23 mm Dia. Ball Bore Gauges Two 24 mm Dia. Ball Bore Gauges Two 25 mm Dia. Ball Bore Gauges | 0000000 | 000000 |