25B26H X 5/16 MPB-A Sprocket, Bore Diameter 5/16 in, For Chain Pitch 1/4 in, For Number of Strands Single, Hub Type One Side, Material Steel, Maximum Bore Diameter 1 in, Number of Teeth 26, Outside Diameter 2.209 in, Pitch Diameter 2.074 in, Bore Type Plain, Chain Number 25, Finish Black Oxide, Hub Diameter 1 1/2 in, Hub Projection 0.515 in, Keyway No, Keyway Depth Not Applicable, Keyway Width Not Applicable, Length through Bore 5/8 in, Number of Set Screws 0, Set Screw Location Not Applicable