21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 39 Teeth; 23.368MM Face Width; Bushed; 112.014MM Flange OD; 97.714MM OD; 99.314MM Pitch Diam; Keyway; 12.7 To 42.863MM Bushing Bore Range; 1610 Bushing; No Minimum Plain Bore