Synchronous Pulley; 21MM Belt Width; 8 Millimeter Belt Pitch; 8M-21 Belt Style; 50 Teeth; 24.638MM Face Width; Bushed; 131MM Flange OD; 125.73MM OD; 127.34MM Pitch Diam; Yes Keyway; 14 To 50MM Bushing Bore Range; 2012 Bushing; No Minimum Plain Bore