Single Strand Sprocket, Bore Diameter 1 1/8 in, For Chain Pitch 1/2 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 1/8 in, Number of Teeth 15, Outside Diameter 2.65 in, Pitch Diameter 2.405 in, Bore Type Fixed, Chain Number 40, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 1 13/16 in, Hub Projection 0.591 in, Includes Set Screws, Keyway Yes, Keyway Depth 1/8 in, Keyway Width 1/4 in, Length through Bore 7/8 in, Material Grade 1045