Single Strand Sprocket, Bore Diameter 1 1/4 in, For Chain Pitch 1/2 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 1/4 in, Number of Teeth 23, Outside Diameter 3.94 in, Pitch Diameter 3.672 in, Bore Type Fixed, Chain Number 40, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 3 in, Hub Projection 0.716 in, Includes Set Screws, Keyway Yes, Keyway Depth 1/8 in, Keyway Width 1/4 in, Length through Bore 1 in, Material Grade 1045