Sprocket Bore Diameter 1 in For Chain Pitch 1 1/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 in Number of Teeth 10 Outside Diameter 4.6 in Pitch Diameter 4.045 in Bore Type Fixed Chain Number 100 Finish Black Oxide Hub Diameter 3 1/4 in Hub Projection 1.183 in Includes Set Screws Keyway Yes Keyway Depth 1/8 in Keyway Width 1/4 in Length through Bore 1 7/8 in Number of Set Screws 2