Provides a large clamping surface and therefore spreading the load of a fastening. Plated in Trivalent Chromium (Cr3) Zinc"Hole Dia. mm - M10Length mm - 40Width mm - 40Thickness mm - 5.0Finish - Zinc & Clear Cr3Material - Carbon Steel Timco Square Plate Washers - Zinc (Size M10 x 40 x 40 x 5 - 100 Pieces) in Silver Size: 1000mm x 1000mm