Attributes . 21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 29 Teeth; 23.368MM Face Width; Bushed; 78.486MM Flange OD; 72.238MM OD; 73.838MM Pitch Diam; Keyway; 12.7 To 28.575MM Bushing Bore Range; 1108 Bushing; No Minimum Plain Bore . Names