Package Includes: You get 80pcs expansion screw in 4 sizes, 20pcs & 20pcs M5 & 20pcs M6 & 20pcs M8. The different specifications can meet your diverse needs of use. Quality Material: The jack nut is made of high quality carbon steel material with electroplated zinc finished, rustproof and -, high hardnessand, hard to deform and break, you for a long time. Easy To Install: These petal shaped metal nuts are easy installation. Just insert jack nut into the hole, then use a professional rivet tool clamp the rivet nut and hold the screw and material in place. Precise Product Detail: This metal petal nut has precise dimensions and threads, and can perfectly fit the hole and bolt. Wide Application: These petal nuts are perfect for various kinds of base material, such as iron plate, hollow plate, aluminum alloy frame, wall paperboard, wall cabinet, wall panels, coat racks, cardboard, thin plastic, license plate, drying rack and container tag, ., Manufacturer: Akfldms