Tapered Bushing Sprockets (TL) Bushing-Bore Sprockets for ANSI Roller Chain. Modify bore size without changing your sprocket.Easy to set up, Taper-Bushed Sprockets give you the flexibility to utilize the same sprocket with different shaft diameters. Buy Taper-Bushings(Sold separately) to complement the bore sizes you will need. Use with ANSI solitary and double-strand chain. These metal sprockets and bushings meet all ANSI requirements.