Tapered Bushing Sprockets (TL) sprockets Bushing-Bore Sprockets for ANSI Roller Chain. Change bore size without replacing your sprocket.Easy to install, 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 single and double-strand chain. These metal sprockets and bushings meet all ANSI requirements.