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 provide you with the flexibility to use the same sprocket with different shaft diameters. Purchase Taper-Bushings(Sold separately) to complement the bore sizes you need. Use with ANSI one and double-strand chain. These metal sprockets and bushings fulfill all ANSI requirements.