[High Quality Material] Made of 304 stainless steel, one of the best quality corrosion resistant metal. Non-toxic, good oxidation resistance, long service life, not easy to deform under high pressure. High precision thread These rivet nuts have deep thread knurling inside, which has good friction and biting force, fixing and anti-slip effect. Fastening performance Blind rivet nuts have good fastening performance and can be inserted into fixed and deformed parts. [EASY TO USE] These threaded round inserts can be inserted into closed objects simply by drilling an appropriately sized hole and installing with a hex wrench. In addition, it is lightweight and very easy to carry. [WIDE APPLICATIONS] It is a great replacement for industrial and construction fasteners, and also an important accessory in your daily life. Suitable for electrical and industrial products such as automobiles, furniture, decorations, crafts, etc. Four sizes, 20 eachNote: The data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be some difference in color, the actual object received shall prevail.Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual item received shall prevail.