... /SPZ type pulleys,American Standard pulley,3V-5V-8V pulleys ,cast iron sheaves, steel sheaves, AK sheaves, belt Pulleys(SPA SPB SPC ... .variable pith sheaves,EUROPE type sheaves.taper bushings.Material: 45C.GG25,GGG40,Aluminium,etc.surface treatment :black oxide,phosphate,painted or ...