Roller Chain Sprocket Bore Diameter 14 mm For Chain Pitch 3/8 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 14 mm Number of Teeth 13 Outside Diameter 1.82 in Pitch Diameter 39.8 mm Bore Type Fixed Chain Number 06B Finish Black Oxide Hub Diameter 29 mm Hub Projection 0.775 in Includes Set Screws Keyway Yes Keyway Width 5 mm Length through Bore 25 mm Number of Set Screws 2