Sprocket Bore Diameter 1 7/16 in For Chain Pitch 5/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 7/16 in Number of Teeth 17 Outside Diameter 3.72 in Pitch Diameter 3.401 in Bore Type Fixed Chain Number 50 Finish Black Oxide Hub Diameter 2 11/16 in Hub Projection 0.657 in Includes Set Screws Keyway Yes Keyway Depth 3/16 in Keyway Width 3/8 in Length through Bore 1 in Number of Set Screws 2