Kits include five cutters, a pilot pin, and a hex key. Unlike drill bits, these cut only on the periphery of the hole and produce a solid slug. For use with magnetic-base drills. They're also known as annular cutters. Pilot pins align the cutter and eject the slug. They're also known as ejector pins.

Hollow-Core Cutter Arbor Adapters—You can also pair the cutters with an arbor adapter (sold separately) when using a manual drill press or milling machine.