Roller Chain Sprocket, Bore Diameter 1 in, For Chain Pitch 3/4 in, For Number of Strands Double, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 in, Number of Teeth 18, Outside Diameter 4.7 in, Pitch Diameter 4.319 in, Bore Type Fixed, Chain Number 60-2, Finish Black Oxide, Hub Diameter 3 7/16 in, Hub Projection 0.784 in, Includes Set Screws, Keyway Yes, Keyway Width 1/4 in, Length through Bore 2 1/8 in