... , multi wedge pulleys. 3. V-belt pulley for taper bush, with solid hubs. Standard sheaves, taper bushes sheaves, AK, BK series ... . GG25, GGG40, Aluminium, etc. 5. Surface treatment: Black oxide, phosphate, painted or passavited. 6. With standardized desigh and well equipped CNC machining ... °±0.5°-031538°±0.5° Casting V-Belt Steel Pulleys with Black Coating