Tapered Bushing Sprockets (TL) Bushing-Bore Sprockets for ANSI Roller Chain. Change bore size without replacing 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(Marketed separately) to complement the bore sizes you will need. Use with ANSI one and double-strand chain. These metal sprockets and bushings satisfy all ANSI requirements.