POWGE 20 Teeth HTD 3M Timing Pulley Bore 5/6/6.35/7/8/10mm for Width 10mm 3M synchronous belt HTD3M pulley Belt gear 20Teeth 20TPOWGE 20 Teeth HTD 3M Timing Pulley Bore 5/6/6.35/7/8/10mm for Width 10mm 3M synchronous belt HTD3M pulley Belt gear 20Teeth 20T