Tapered Bushing Sprockets (TL) Bushing-Bore Sprockets for ANSI Roller Chain. Alter bore size chain sprocket without replacing your sprocket.Easy to set up, Taper-Bushed Sprockets give you the flexibility to utilize the same sprocket with different shaft diameters. Purchase Taper-Bushings(Offered separately) to match the bore sizes you need. Use with ANSI single and double-strand chain. These metal sprockets and bushings meet all ANSI requirements.