A square section spring washer designed to prevent the nut from loosening. Plated in Trivalent Chromium (Cr3) Zinc"Hole Dia. mm - M6Length mm - 9.9Width mm - 3.2Thickness mm - 1.6Finish - Zinc & Clear Cr3Material - Carbon Steel Timco Spring Washers - Zinc (Size M6 - 500 Pieces) in Silver Size: 1000mm x 1000mm