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