004 in, Thickness Tolerance +/-0.75 in, Inside Diameter Tolerance +0.0005 in, Keyway Width 1/2 in, Keyway Depth 3/16 in, Round Shim Type Arbor Spacer, Material Steel, Finish Plain, Temper Full Hard, Material Grade/Class Ungraded, Rockwell Hardness B90, Tensile Strength 80,000 psi, Manufacturer Location Made in USA*, Package Quantity 10.002 in, Thickness 0.