With a tall, narrow head, these pins fit in tight spaces and have a D-ring you can grab and pull with one finger. Two retaining balls hold the pin in place until you push the button to release. Also known as R-style marine pins.

The most common choice for tight spaces. The split ring folds down when these pins are installed, and you can pull with just one finger to remove. Keep them from getting lost by adding a lanyard, or choose a pin that includes one. You can also attach tags to the ring to identify components. Pins have a retaining ball to hold them in place.