Petal Shape Metal Nut: High quality jack nuts made of high quality carbon steel, its rust and corrosion resistance has been enhanced by galvanizing technology for longer use,can resist the corrosion and rust in marine environments. Durable Construction: Petal nuts are made of quality stainless steel material, which is built to last and can withstand the rigors of frequent use, expanded head of the nut is larger and can be securely fastened to the plate, it has good load-bearing capacity. Easy Installation: Threaded insert design of the petal nuts makes them easy to install, even in thin or soft walls, without the need for tools or equipment Secure Mounting: Expansion anchors can provide a secure and reliable mounting solution, ensuring that your fixtures and fittings stay firmly in place Versatility: The petal nuts can be used with a of materials, including plastic, , hollow wall, iron skin, and more, making them a versatile addition to any diy or construction project, that can meet all your . Will not distort or deform soft plastics or thin sheet metal Zinc Finish for Improved Corrosion Resistance.High Quality Carbon Steel with High Hardness.Anti-Corrosion and , No Burr and Flanged Anti-Slip Design Nut Type:Expansion Screw Petal Nut Nut Sizes: Total Length:22.7mm Screws external diameter:12mm Colour:Silver Material:stainless steel+steel+iron Size:4x20mm Package Contents: 80 * Petal Shape Metal Nut Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.