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