Roller Chain Sprocket; 3" Bore; 24B-1 Chain; 24 Teeth; 1 Row of Teeth; Hardened Teeth; 12.294" Outside Diameter; 11.492" Pitch Diameter; C-Hub Both Sides; Finished Bore Mount; No Bushing; 1-1/2" Chain Pitch; ISO Roller Chain; Keyway; Steel Material