Tapered Bushing Sprockets (TL) Bushing-Bore Sprockets for ANSI Roller Chain. Alter 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. chain sprocket Purchase Taper-Bushings(Marketed separately) to match the bore sizes you need. Use with ANSI single and double-strand chain. These metal sprockets and bushings fulfill all ANSI requirements.