Roller Chain Sprocket Bore Diameter 45 mm For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 45 mm Number of Teeth 20 Outside Diameter 7 in Pitch Diameter 162.37 mm Bore Type Fixed Chain Number 16B Finish Black Oxide Hub Diameter 108 mm Hub Projection 1.134 in Includes Set Screws Keyway Yes Keyway Width 14 mm Length through Bore 45 mm Number of Set Screws 2