Roller Chain 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 3/4 in Number of Teeth 9 Outside Diameter 2.51 in Pitch Diameter 2.193 in Bore Type Fixed Chain Number 60 Finish Black Oxide Hub Diameter 1 9/16 in Hub Projection 0.791 in Includes Set Screws Keyway Yes Keyway Width 3/16 in Length through Bore 1 1/4 in Number of Set Screws 2