21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 67 Teeth; 23.368MM Face Width; Bushed; 174.625MM Flange OD; 169.012MM OD; 170.612MM Pitch Diam; Keyway; 12.7 To 68.263MM Bushing Bore Range; 2517 Bushing; No Minimum Plain Bore