Roller Chain Sprocket Bore Diameter 2 in For Chain Pitch 1 in For Number of Strands Double Hub Type One Side Material Steel Maximum Bore Diameter 2 in Number of Teeth 24 Outside Diameter 8.2 in Pitch Diameter 7.661 in Bore Type Fixed Chain Number 80-2 Finish Black Oxide Hub Diameter 5 in Hub Projection 1.04 in Includes Set Screws Keyway Yes Keyway Width 1/2 in Length through Bore 2 3/4 in Set Screw Location Setscrews are Placed Over the Keyway and at 90 Degrees to the Keyway