kinds of Timing Belt Pulley Pulley type:MXL,XL,L,H,XH, ... steel,iron,plastic,nylon,etcMax width of the pulley :520mm.Surface treatment:High frequency,black of oxidation,zincing,nickelage,anode.Machine:CNC ... engine lathe,milling machine,drilling machine,gear shaper,hobbing machine,grinder,testing center belt conveyor drum ...