Quality Material - these self locking washers are made of low carbon steel and galvanized coating, which feature good insulation performance, strong bearing capacity, strong durability, and are not easy to rust or deform. Self locking washers round is made of mild steel, insulation dome cap washers are made of aluminum, which can be well matched workFunction - The base of the insulation pin is self-adhesive,it allows you to fix insulation panels easily and conveniently.Easy To Install - Easy to use: Firstly ensure the wall is clean, flat and dry.Peel off the plastic paper on the back of the self-adhesive nail plate,and attach the base of the insulation nail to the ceiling or wall and pierce the insulation panel into the nail.To ensure stability, you should place at least one nail at each corner of insulation panel.