Extra Thick Oversized Washer, Flat Washer Type Standard, Dimensional Standards TCMAI, Material Steel, Material Grade/Class C1010, Finish Black Oxide, For Screw Size 3/8 in, Inside Diameter 0.406 in, Outside Diameter 7/8 in, Maximum Thickness 3/16 in, System of Measurement Inch, Minimum Thickness 11/64 in, Color Black, Made in North America Made in North America, Material Quality Standards Not Applicable, Maximum Temperature 400 Degrees F, Pack Size Small Pack, Thickness Tolerance +/-1/64 in