Synchronous Pulley; 20MM Belt Width; 8MM Belt Pitch; 8M-20 Belt Style; 64 Teeth; 28.575MM Face Width; Bushed; 170.586MM Flange OD; 161.595MM OD; 162.966MM Pitch Diameter; Yes Keyway; 24 To 42MM Bushing Bore Range; SDS Bushing; No Minimum Plain Bore