Package includes: You will receive 20 petal nuts for expansion screws, including 4 sizes M4 M5 M6 M8, 5 pieces of each size, different specifications compatible with meeting your daily use. Premium material: These jack nuts are made of high-quality carbon steel with electroplated zinc treatment, rust-proof and corrosion-resistant, reliable and can serve you for a long time. Easy to install: These metal nuts are easy to install. You just need to use a professional riveting tool, or clamp the rivet nut with a wrench, then use a screwdriver compatible with holding the screw and material in place compatible with finally completing the installation. Precise production: These petal-shaped metal nuts have precise dimensions and threads, and can fit perfectly into the hole and bolt. Wide application: These carbon steel screw nuts are perfect compatible with iron plate, hollow plate, aluminum frame, license plates, drying racks and container labels, etc. Material: Carbon steel Color: silver Package contents: 1 set x petal rivet nuts Only the above compatible with package content, other products are not included. Note: Light reflection and different displays may cause the color of the product in the picture to differ slightly from the real item. The allowed measurement error is +/- 1-3 cm.