Synchronous Pulley; 1" Belt Width; 1/2 Inch Belt Pitch; H Belt Style; 20 Teeth; 1-5/16" Face Width; Rough Bore; 3-7/16" Flange OD; 3.129" Outside Diameter; 3.183" Pitch Diameter; No Keyway; No Bushing; Yes Minimum Plain Bore; 1-5/8"