21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 22 Teeth; 23.368MM Face Width; Rough Bore; 66.294MM Flange OD; 54.432MM OD; 56.032MM Pitch Diam; No Keyway; No Bushing; Minimum Plain Bore; 1.188" Max Bore