Sprocket, Bore Diameter 3/8 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 25, Outside Diameter 2.129 in, Pitch Diameter 1.995 in, Bore Type Plain, Chain Number 25, Finish Black Oxide, For Pitch Type Single Pitch, Hub Diameter 1 1/2 in, Hub Projection 0.515 in, Includes Set Screws, Keyway Yes, Keyway Depth 3/64 in, Keyway Width 3/32 in, Length through Bore 5/8 in, Material Grade 1045