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 20 Outside Diameter 2.59 in Pitch Diameter 2.397 in Bore Type Fixed Chain Number 35 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 1 15/16 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