This is a 10mm plug follower for locksport that I added a pin sized hole to for reloading pins in a lock. Works for Paclock 90-A Pros, American Lock 1100s, and any other lock with the same size plug and pins. The idea is that when you want to reload the pins in the lock you line the hole up with the pin you want to load, drop the spring and pin in through the hole in the bottom of the cylinder and then use a toothpick or paperclip to press the pin down as you push the follower through to cover the pin you just loaded. Makes reloading locks a lot easier than trying to do it with tweezers.