Flat Washers, Flat Washer Type Standard, Dimensional Standards DIN 125-1A, Material Steel, Material Grade/Class Class 8.8, Finish Zinc-Plated, For Screw Size M16, Inside Diameter 17 mm, Outside Diameter 30 mm, Maximum Thickness 3 mm, System of Measurement Metric, Minimum Thickness 3 mm, Color Silver, Inside Diameter Tolerance 0.669-0.68, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards ASTM A-325