21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 26 Teeth; 23.368MM Face Width; Bushed; 73.812MM Flange OD; 64.618MM OD; 66.218MM Pitch Diam; Keyway; 12.7 To 28.575MM Bushing Bore Range; 1108 Bushing; No Minimum Plain Bore