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