60BS16H X 1 1/4-A Sprocket, Bore Diameter 1 1/4 in, For Chain Pitch 3/4 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 1/4 in, Number of Teeth 16, Outside Diameter 4.22 in, Pitch Diameter 3.845 in, Bore Type Fixed, Chain Number 60, Finish Black Oxide, Hub Diameter 3 1/16 in, Hub Projection 0.791 in, Includes Set Screws, Keyway Yes, Keyway Depth 1/8 in, Keyway Width 1/4 in, Length through Bore 1 1/4 in, Number of Set Screws 2