Roller Chain Sprocket Bore Diameter 2 in For Chain Pitch 1 1/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 2 in Number of Teeth 26 Outside Diameter 11.05 in Pitch Diameter 10.37 in Bore Type Fixed Chain Number 100 Finish Black Oxide Includes Set Screws Keyway Yes Keyway Width 1/2 in Length through Bore 2 in Number of Set Screws 2 Set Screw Location One Setscrew Over the Keyway and A Second Setscrew at 90 Degrees Set Screw Size 1/2 in