21MM Belt Width; 8MM Belt Pitch; 8M-21 Poly Chain GT2 Belt Style; 50 Teeth; 24.638MM Face Width; Bushed; 137.414MM Flange OD; 125.73MM OD; 127.33MM Pitch Diam; Keyway; 12.7 To 53.975MM Bushing Bore Range; 2012 Bushing; No Minimum Plain Bore