Sprocket Bore Diameter 1 7/16 in For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 7/16 in Number of Teeth 24 Outside Diameter 8.2 in Pitch Diameter 7.661 in Bore Type Fixed Chain Number 80 Finish Black Oxide Hub Diameter 4 1/4 in Hub Projection 1.175 in Includes Set Screws Keyway Yes Keyway Depth 3/16 in Keyway Width 3/8 in Length through Bore 1 3/4 in Number of Set Screws 2