Roller Chain Sprocket; 1-15/16" Bore; 100-2 Chain; 39 Teeth; 2 Row of Teeth; No Hardened Teeth; 16-15/64" Outside Diameter; 15.535" Pitch Diameter; C-Hub Both Sides; Finished Bore Mount; No Bushing; 1-1/4" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material