12MM Belt Width; 8MM Belt Pitch; 8M-12 Poly Chain GT2 Belt Style; 39 Teeth; 18.288MM Face Width; Bushed; 112.014MM Flange OD; 97.714MM OD; 99.314MM Pitch Diam; Keyway; 12.7 To 42.863MM Bushing Bore Range; 1610 Bushing; No Minimum Plain Bore

20MM Belt Width; 14MM Belt Pitch; 14M-20 Poly Chain GT2 Belt Style; 39 Teeth; 26.416MM Face Width; Bushed; 191.008MM Flange OD; 170.993MM OD; 173.787MM Pitch Diam; Keyway; 12.7 To 68.263MM Bushing Bore Range; 2517 Bushing; No Minimum Plain Bore