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