The Hudson Lock HPC-SUT-14 Hollow Brass Follower Set contains 3 popular sizes of hollow brass followers. Use these followers on a variety of locks including the Corbin Russwin heavy duty knob lock cylinder units. The small diameter follower is useful for cabinet locks, peanut size cylinders, and pin tumbler letterbox locks.This compact kit is efficient and lightweight. All three followers fit in each other for convenient storage and the complete set slips into a tube with blue caps on both ends.