Large O.D. Oversized Washer, Flat Washer Type Standard, Dimensional Standards DIN 9021, Material Steel, Material Grade/Class Case Hardened, Finish Zinc-Plated, For Screw Size M27, Inside Diameter 28 mm, Outside Diameter 50 mm, Maximum Thickness 4 mm, System of Measurement Metric, Minimum Thickness 4 mm, Color Silver, Inside Diameter Tolerance 1.181-1.214, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Material Quality Standards Not Rated