Flat Washer,1 In. Machined F/W 1.063 X 2.5, Dimensional Standards AMPG 2001 FL.04, Material Stainless Steel, Material Grade/Class 316, Finish Plain, For Screw Size 1 in, Inside Diameter 1.063 in, Outside Diameter 2 1/2 in, Maximum Thickness 25/64 in, System of Measurement Inch, Minimum Thickness 23/64 in, Made in North America Made in North America, Material Quality Standards ASTM A276