Roller Chain Sprocket; 2-1/4" Bore; 100-2 Chain; 27 Teeth; 2 Row of Teeth; Hardened Teeth; 11.445" Outside Diameter; 10.768" Pitch Diameter; B-Hub One Side; Finished Bore Mount; No Bushing; 1-1/4" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material