Roller Chain Sprocket; 2-11/16" Bore; 80-2 Chain; 39 Teeth; 2 Row of Teeth; Hardened Teeth; 12.987" Outside Diameter; 12.428" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material