Sprocket Bore Diameter 5/8 in For Chain Pitch 5/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 5/8 in Number of Teeth 16 Outside Diameter 3.52 in Pitch Diameter 3.204 in Bore Type Fixed Chain Number 50 Finish Black Oxide Hub Diameter 2 1/2 in Hub Projection 0.657 in Includes Set Screws Keyway Yes Keyway Depth 3/32 in Keyway Width 3/16 in Length through Bore 1 in Number of Set Screws 2