Comprehensive Set: This kit includes 80 expansion screw petal nuts in sizes -20, -25, M5-25, and M6-25, catering to diverse fixing needs. Each nut is galvanized to resist , ensuring and reliability in environments. User-Friendly Installation: Easily install these nuts using two wrenches or pliers-one to hold the nut steady and the other to tighten the screw. This method prevents the nut from and ensures a secure fit without damaging the threads. Efficient Mechanism: Insert the screw through the item to be mounted, then attach and tighten the nut. As the nut is tightened, it expands, enhancing its grip and stability on the material, making it ideal for secure installations. Material: Crafted from high-quality carbon steel, these expansion screw petal nuts are robust, rust-, and built to last. The expanded head design provides excellent load-bearing capacity and a firm hold on sheet materials. Versatile Applications: Perfect for mounting thin materials, these petal nuts work well with plastic, composite wood, hollow walls, and iron sheets. An essential tool for any DIY enthusiast or professional in construction and home improvement projects. Color: Silver Material: Metal Package Contents: 80*expansion screw 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.