Provides a large clamping surface and therefore spreading the load of a fastening. Plated in Trivalent Chromium (Cr3) Zinc"Hole Dia. mm - M12Length mm - 50Width mm - 50Thickness mm - 3.0Finish - Zinc & Clear Cr3Material - Carbon Steel Timco Square Plate Washers - Zinc (Size M12 x 50 x 50 x 3 - 30 Pieces) in Silver Size: 1000mm x 1000mm