Roller Chain Sprocket Bore Diameter 19 mm For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 19 mm Number of Teeth 14 Outside Diameter 1.935 in Pitch Diameter 42.8 mm Bore Type Fixed Chain Number 06B Finish Black Oxide Hub Diameter 31 mm Hub Projection 0.775 in Includes Set Screws Keyway Yes Keyway Width 6 mm Length through Bore 25 mm Number of Set Screws 2