Sprocket, Bore Diameter 1/2 in, For Chain Pitch 1/2 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 7/8 in, Number of Teeth 11, Outside Diameter 2 in, Pitch Diameter 1.775 in, Bore Type Plain, Chain Number 41, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 1 7/16 in, Hub Projection 0.648 in, Includes Set Screws, Keyway Yes, Keyway Depth 1/16 in, Keyway Width 1/8 in, Length through Bore 7/8 in, Material Grade 1045 Constructed of top-grade, heat-treated carbon steel, this Type B single-strand ANSI standard sprocket is for use with standard roller chain. It has a 1-sided hub extension.