Nut Type: Jack NutsNut Sizes: M4Total Length: 22.7mmScrews exterior diameter:12mmMaterial: Zinc Plated The sheet metal had holes that were stripped. Used those nuts they usually labored perfectly. The brace is installed, and the upper part of the door also is stronger.Parts made of high-strength steel. Zinc finish for improved corrosion resistance.High quality carbon metal with high hardness. zinc plated surface, anti-corrosion and anti-oxidation, without a burr and flanged anti-slip design, wear-resistant and extremely practical.Package Included:12Pcs M4 Jack Nuts