Synchronous Pulley; 1/4" Belt Width; 2/25" Belt Pitch; MXL Belt Style; 25 Teeth; 0.389" Face Width; Rough Bore; 0.815" Flange OD; 0.617" OD; 0.637" Pitch Diam; No Keyway; No Bushing; Yes Minimum Plain Bore; 0.25" Max Bore