Roller Chain Sprocket Bore Diameter 1 15/16 in For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 15/16 in Number of Teeth 13 Outside Diameter 4.66 in Pitch Diameter 4.179 in Bore Type Fixed Chain Number 80 Finish Black Oxide Hub Diameter 3 in Hub Projection 0.925 in Includes Set Screws Keyway Yes Keyway Width 1/2 in Length through Bore 1 1/2 in Number of Set Screws 2