... , multi wedge pulleys. 3. V-belt pulley for taper bush, with solid hubs. Standard sheaves, taper bushes sheaves, AK, BK series sheaves ... . 5. Surface treatment: Black oxide, phosphate, painted or passavited. 6. With standardized desigh and well equipped CNC machining systerms. Our pulleys ... °±0.5°-031538°±0.5° Casting V-Belt Steel Pulleys with Black Coating