The 4 Piece Follower Set may be used for rekeying almost any pin tumbler lock. The set is comprised of 4 differently colored Followers to instantly know which diameter tool you need without having to hunt through them all. Set Includes: Two (2) Standard size Followers (LT371-495)f One Small Follower (LT371-395)f One Large Follower (LT371-555)f Each of the machined aluminum Followers can be purchased individually.