Roller Chain Sprocket Bore Diameter 30 mm For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 30 mm Number of Teeth 15 Outside Diameter 5.4 in Pitch Diameter 122.17 mm Bore Type Fixed Chain Number 16B Finish Black Oxide Hub Diameter 96 mm Hub Projection 0.937 in Includes Set Screws Keyway Yes Keyway Width 8 mm Length through Bore 40 mm Number of Set Screws 2