Sprocket, Bore Diameter 1/4 in, For Chain Pitch 1/4 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 7/8 in, Number of Teeth 20, Outside Diameter 1.729 in, Pitch Diameter 1.598 in, Bore Type Plain, Chain Number 25, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 1 1/4 in, Hub Projection 0.515 in, Includes Set Screws, Keyway Yes, Length through Bore 5/8 in, Material Grade 1045, Resistance Properties Corrosion Resistant