A square section spring washer designed to prevent the nut from loosening. Plated in Trivalent Chromium (Cr3) Zinc"Hole Dia. mm - M8Length mm - 12.7Width mm - 4Thickness mm - 2.0Finish - Zinc & Clear Cr3Material - Carbon Steel Timco Spring Washers - Zinc (Size M8 - 250 Pieces) in Silver Size: 1000mm x 1000mm