Flat Washer, Flat Washer Type Standard, Dimensional Standards TCMAI standards, Material Steel, Material Grade/Class Not Graded, Finish Black Oxide, For Screw Size #1, Inside Diameter 1.031 in, Outside Diameter 2 in, Maximum Thickness 0.204 in, System of Measurement Inch, Minimum Thickness 0.172 in, Color Black, Maximum Temperature 400 Degrees F, Thickness Tolerance +/-1/64 in, Package Quantity 10