This product consists of elements made from Polyamide 6.6 (nylon) or polypropylene-ethylene copolymer, which influence the aging of the material, rust, and decay. They feature characteristics that absorb vibrations and sound, are good electrical insulators, and cause interruption in operation and compression. They are chemically resistant. The wooden screw is made of electro-galvanized steel and has a hollow head with a cross slot. Suitable application: in any structures made of concrete and masonry, stone, perforated bricks, and aerated concrete.