Roller Chain Sprocket; 1/2" Bore; 41 Chain; 12 Teeth; 1 Row of Teeth; No Hardened Teeth; 2.166" Outside Diameter; 1.932" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1/2" Chain Pitch; ANSI Roller Chain; No Keyway; Steel Material