Roller Chain Sprocket Bore Diameter 1 1/4 in For Chain Pitch 3/4 in For Number of Strands Double Hub Type One Side Material Steel Maximum Bore Diameter 1 1/4 in Number of Teeth 11 Outside Diameter 3 in Pitch Diameter 2.663 in Bore Type Fixed Chain Number 60-2 Finish Black Oxide Hub Diameter 1 13/16 in Hub Projection 0.784 in Includes Set Screws Keyway Yes Keyway Width 1/4 in Length through Bore 2 1/8 in