Roller Chain Sprocket Bore Diameter 10 mm For Chain Pitch 3/8 in For Number of Strands Single Hub Type No Hub Material Steel Maximum Bore Diameter 32 mm Number of Teeth 24 Outside Diameter 3.125 in Pitch Diameter 72.97 mm Bore Type Plain Chain Number 06B Finish Black Oxide Hub Diameter Not Applicable Hub Projection Not Applicable Keyway No Keyway Depth Not Applicable Keyway Width Not Applicable Length through Bore 3/16 in Number of Set Screws 0