Package Includes: You will receive 20pcs expansion screw petal nuts, including 4 sizes of M4 M5 M6 M8, 5pcs of each size, different specifications to meet your daily use. Premium Material: These jack nuts are made of high-quality carbon steel material with electroplated zinc finished, rustproof 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 rivet tool, or clamp the rivet nut with a wrench, then use a screwdriver to hold the screw and material in place to complete the installation. Precise Production: These petal shape metal nuts have precise dimensions and threads, and can perfectly fit the hole and bolt. Wide Application: These carbon steel screw nuts are perfect for iron plate, hollow plate, aluminum alloy frame, license plate, drying rack and container tag, ect. Material: Carbon steel colour: silver Package Contents: 1 set x petal rivet nuts Only the above package content, other products 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.