Roller Chain Sprocket Bore Diameter 3/4 in For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 3/4 in Number of Teeth 34 Outside Diameter 4.264 in Pitch Diameter 4.064 in Bore Type Fixed Chain Number 35 Finish Black Oxide Includes Set Screws Keyway Yes Keyway Width 3/16 in Length through Bore 7/8 in Number of Set Screws 2 Set Screw Location One Setscrew Over The Keyway and A Second Setscrew at 90 Degrees