21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 37 Teeth; 23.368MM Face Width; Bushed; 102.718MM Flange OD; 92.608MM OD; 94.209MM Pitch Diam; Keyway; 12.7 To 42.863MM Bushing Bore Range; 1610 Bushing; No Minimum Plain Bore