Roller Chain Sprocket Bore Diameter 2 in For Chain Pitch 1 1/4 in For Number of Strands Single Hub Type One Side Material Steel Maximum Bore Diameter 2 in Number of Teeth 12 Outside Diameter 5.42 in Pitch Diameter 4.83 in Bore Type Fixed Chain Number 100 Finish Black Oxide Hub Diameter 4 in Hub Projection 1.183 in Includes Set Screws Keyway Yes Keyway Width 1/2 in Length through Bore 1 7/8 in Number of Set Screws 2