Sprocket Bore Diameter 1/4 in For Chain Pitch 1/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 9/16 in Number of Teeth 15 Outside Diameter 1.326 in Pitch Diameter 1.202 in Bore Type Plain Chain Number 25 Finish Black Oxide Hub Diameter 7/8 in Hub Projection 0.39 in Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 1/2 in Number of Set Screws 0 Set Screw Location Not Applicable