Arbor Spacer, Inside Diameter 1.375 in, Outside Diameter 1.875 in, Inside Diameter Tolerance +0.011/-0.000 in, Outside Diameter Tolerance +/-0.002 in, Thickness 0.006 in, Thickness Tolerance +/-0.0005 in, Keyway Width 5/16 in, Keyway Depth 1/8 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