Roller Chain Sprocket Bore Diameter 1 in For Chain Pitch 1 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 1 in Number of Teeth 19 Outside Diameter 6.59 in Pitch Diameter 6.076 in Bore Type Fixed Chain Number 80 Finish Black Oxide Hub Diameter 4 1/4 in Hub Projection 0.925 in Includes Set Screws Keyway Yes Keyway Width 1/4 in Length through Bore 1 1/2 in Number of Set Screws 2