Single Strand Sprocket, Bore Diameter 7/8 in, For Chain Pitch 5/8 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 7/8 in, Number of Teeth 12, Outside Diameter 2.71 in, Pitch Diameter 2.415 in, Bore Type Fixed, Chain Number 50, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 2 in, Hub Projection 0.657 in, Includes Set Screws, Keyway Yes, Keyway Depth 3/32 in, Keyway Width 3/16 in, Length through Bore 1 in, Material Grade 1045