Roller Chain Sprocket; 5/8" Bore; 35 Chain; 12 Teeth; 2 Row of Teeth; No Hardened Teeth; 1-5/8" Outside Diameter; 1.449" Pitch Diameter; B-Double Single; Finished Bore Mount; No Bushing; 3/8" Chain Pitch; ANSI Roller Chain; Keyway; Steel Material