Roller Chain Sprocket; 1" Bore; 43 Chain; 40 Teeth; 1 Row of Teeth; 168.2MM Outside Diameter; 70MM Hub Diameter; 16MM Pilot; 12.7MM Pitch; 3.3MM Roller Width; 7.75MM Roller Diameter; 3MM Single Tooth Width; 25MM Overall Width; Hub Steel; Keyway with Set Screw