Roller Chain Sprocket Bore Diameter 1 1/8 in For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 1/8 in Number of Teeth 9 Outside Diameter 3.35 in Pitch Diameter 2.924 in Bore Type Fixed Chain Number 80 Finish Black Oxide Hub Diameter 2 1/4 in Hub Projection 1.05 in Includes Set Screws Keyway Yes Keyway Width 1/4 in Length through Bore 1 5/8 in Number of Set Screws 2