Sprocket Bore Diameter 3/4 in For Chain Pitch 3/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 2 3/4 in Number of Teeth 26 Outside Diameter 6.63 in Pitch Diameter 6.222 in Bore Type Plain Chain Number 60 Finish Black Oxide For Pitch Type Single Pitch Hub Diameter 4 in Hub Projection 0.791 in Includes Set Screws Keyway Yes Keyway Depth 3/32 in Keyway Width 3/16 in Length through Bore 1 1/4 in Material Grade 1045