Roller Chain Sprocket; 2-1/8" Bore; 100 Chain; 26 Teeth; 1 Row of Teeth; Hardened Teeth; 11.045" Outside Diameter; 10.37" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1-1/4" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material