The product is made from polyamide 6.6 (nylon) or copolymer polypropylene-ethylene. These materials influence the aging of the material, corrosion, and deterioration. They provide shock and sound absorption, and are good electrical insulators, causing disruption in operation and compression. They are resistant to chemicals. The wood screws are made from electro-galvanized steel. The screws feature a cross recessed head. Usage: suitable for any concrete and masonry, stone, perforated bricks, and aerated concrete.