12MM Belt Width; 8MM Belt Pitch; 8M-12 Poly Chain GT2 Belt Style; 56 Teeth; 14.478MM Face Width; Bushed; 152.654MM Flange OD; 140.995MM OD; 142.596MM Pitch Diam; Keyway; 12.7 To 53.975MM Bushing Bore Range; 2012 Bushing; No Minimum Plain Bore