21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 60 Teeth; 24.638MM Face Width; Bushed; 163.068MM Flange OD; 151.181MM OD; 152.781MM Pitch Diam; Keyway; 12.7 To 53.975MM Bushing Bore Range; 2012 Bushing; No Minimum Plain Bore