Rekeying tool - Plug follower set for most common size cylinders.The Hollow Brass Follower Set contains 3 popular sizes of chrome plated, 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 plastic caps on both ends. Includes these three sizes: .550" (14mm) Diameter .495" (12.6mm) diameter .395" (10mm) Diameter.