Roller Chain Sprocket Bore Diameter 3/8 in For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 3/8 in Number of Teeth 9 Outside Diameter 1.26 in Pitch Diameter 1.096 in Bore Type Fixed Chain Number 35 Finish Black Oxide Hub Diameter 7/8 in Hub Projection 0.582 in Includes Set Screws Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 3/4 in Number of Set Screws 2