Extra Thick Oversized Washer, Flat Washer Type Standard, Dimensional Standards TCMAI, Material Stainless Steel, Material Grade/Class 303, Finish Plain, For Screw Size 3/8 in, Inside Diameter 0.406 in, Outside Diameter 7/8 in, Maximum Thickness 1/8 in, System of Measurement Inch, Minimum Thickness 7/64 in, Color Silver, Made in North America Made in North America, Material Quality Standards Not Applicable, Maximum Temperature 750 Degrees F, Pack Size Small Pack, Rockwell Hardness B97