Sprocket Bore Diameter 3/4 in For Chain Pitch 3/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 1/2 in Number of Teeth 13 Outside Diameter 3.49 in Pitch Diameter 3.134 in Bore Type Plain Chain Number 60 Finish Black Oxide Hub Diameter 2 3/8 in Hub Projection 0.791 in Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 1 1/4 in Number of Set Screws 0 Set Screw Location Not Applicable