Roller Chain Sprocket Bore Diameter 30 mm For Chain Pitch 3/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 30 mm Number of Teeth 14 Outside Diameter 3.8 in Pitch Diameter 85.61 mm Bore Type Fixed Chain Number 12B Finish Black Oxide Hub Diameter 64 mm Hub Projection 0.94 in Includes Set Screws Keyway Yes Keyway Width 8 mm Length through Bore 35 mm Number of Set Screws 2