Tapered Bushing Sprockets (TL) Bushing-Bore Sprockets for ANSI Roller Chain. Alter bore size without changing your sprocket.Easy to install, Taper-Bushed Sprockets give you the flexibility to use the same sprocket with different shaft diameters. Buy Taper-Bushings(Marketed separately) to match the bore sizes you will need. Use with ANSI single and double-strand chain. These metal sprockets and bushings satisfy all ANSI requirements.