These petal nuts are designed for manual and pneumatic tools. The installation is very simple, you can use a wrench or pliers. One way is to fix the rivet nut so that it does not rotate after being inserted into the hole. the appropriate size screws into the nuts. Tighten the nut with another wrench/pliers. When you tighten the screws/bolts, the nuts curl and secure in place. Don't tighten it tightly, otherwise the wire may peel off. These Jack Nuts with Screws are perfect for a wide range of applications, from household DIY projects to industrial installations. They are especially effective in thin or hollow materials where traditional fasteners fail, such as hollow doors, aluminum frames, and license plates. This kit includes 4 sizes of M5 M6 M8, each with 20 jack nuts and petal nuts, providing ample quantity for all your installation needs. Whether for personal projects or professional applications, this assortment ensures you have the right size for every task, making it an indispensable part of your toolkit. Made from high-quality carbon steel and enhanced with galvanizing technology, these Jack Nuts offer superior rust and resistance. This makes them ideal for long-term use in various environments, including marine settings, ensuring reliability and a longer service life. Choose expansion petal nut for excellent reliability and service life. The expansion head of the nut is relatively large and can be firmly fixed on the plate, with good load-bearing capacity, durability, and long service life., Weight: 1.59173753164 pounds, Manufacturer: Xnuiasqe