Single Strand Sprocket Bore Diameter 1/2 in For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1/2 in Number of Teeth 13 Outside Diameter 1.75 in Pitch Diameter 1.567 in Bore Type Fixed Chain Number 35 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 1 1/4 in Hub Projection 0.582 in Includes Set Screws Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 3/4 in