The use of double-headed nails in the plastic and asbestos-fixing applications in the use of plastic products and asbestos tiles, will choose the nature of the galvanized U-nails to be fixed, U-nails have the following advantages: 1. One-time fixed, Can be a one-time plastic products and U-nails to be fixed, to avoid the fixed is not strong, repeated pull out, nail into the loss; 2. The use of carbon steel, galvanized surface, corrosion resistance, extend the use of time; The U - shaped nail is a kind of special nail type used to fix the asbestos tile, and the market supply is sufficient. Therefore, the double - hat nail is the best choice for fixing the plastic products and the asbestos products.