Sprocket, Bore Diameter 1 in, For Chain Pitch 5/8 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 in, Number of Teeth 25, Outside Diameter 5.32 in, Pitch Diameter 4.987 in, Bore Type Fixed, Chain Number 50, Finish Black Oxide, Hub Diameter 3 in, Hub Projection 0.907 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