... 3.3M to 14M,T5,T10,MXL, XL, S3M,S5M... Steel Timing Belt PulleyPulley type:MXL,XL,L,H,XH,XXH ... can do as your design.Material for option:aluminium alloy,steel,stainless steel,iron,plastic,nylon,etcMax width of the pulley :520mm ... treatment:High frequency,black of oxidation,zincing,nickelage,anode.Machine:CNC engine lathe,milling machine,drilling machine,gear shaper,hobbing machine,grinder ...