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 1/4 in Number of Teeth 9 Outside Diameter 0.837 in Pitch Diameter 0.731 in Bore Type Plain Chain Number 25 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 7/16 in Hub Projection 0.39 in Includes Set Screws Keyway Yes Length through Bore 1/2 in Material Grade 1045 Resistance Properties Corrosion Resistant