This is a double duty resin.490″ Diameter Plug Follower that also has Cylinder Cap Removal Tool on one end. Unscrews the back threaded cap on most Schlage and ILCO type KIK/KID cylinders. Plastic Resin Tool. PLEASE NOTE: The hole for the tail-piece is a littlesmall so you may have to ream it out with a 1/4″ drill bit to accommodate some of the wider tailpieces.