Sprocket Bore Diameter 1 in For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 2 in Number of Teeth 13 Outside Diameter 4.66 in Pitch Diameter 4.179 in Bore Type Plain Chain Number 80 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 3 in Hub Projection 0.925 in Includes Set Screws Keyway Yes Keyway Depth 1/8 in Keyway Width 1/4 in Length through Bore 1 9/16 in Material Grade 1045