Roller Chain Sprocket; 1/2" Bore; 25 Chain; 15 Teeth; 1 Row of Teeth; No Hardened Teeth; 1.326" Outside Diameter; 1-13/64" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/4" Chain Pitch; ANSI Roller Chain; No Keyway; Steel Material