HTD 3M 36T 38 Tooth AF Type Synchronous wheelType:HTD 3MPitch:3mmTeeth Number: 36T 38 ToothBore:4/5/6/6.35/8/10/12/12.7/14/15/16/17/18/19/20mmKeyway:3/4/5/6Material:Aluminium AlloyFit for Belt Width : 6/10/15/20mmPulley Package :1pcsUse For : CNC mechanical device Synchronous Belt Pulley;3D printer Transmission Pulley;DIY mechanical device Gear.