Synchronous Pulley; 21MM Belt Width; 8MM Belt Pitch; 8MX-21 Belt Style; 224 Teeth; 30.48MM Face Width; Bushed; 568.808MM OD; 570.408MM Pitch Diameter; Yes Keyway; 24 To 80MM Bushing Bore Range; 3020 Bushing; No Minimum Plain Bore