PH-TB self-tapping screws and HD screws are ideal for fixing coverings on materials such as sheet metal, wood and concrete. Thanks to their ability to tap the hole without pre-drilling, these screws simplify and speed up installation, offering a secure and strong fixing on various surfaces. PH-TB self-tapping screws and HD screws are ideal solutions for fastening coverings on materials such as sheet metal, wood and concrete. These screws are designed to make work easier and faster, thanks to their ability to tap the hole without the need to pre-drill the material. This means that, during installation, it will not be necessary to pre-drill holes, thus saving time and effort. PH-TB self-tapping screws are particularly suitable for fixing insulation boards on sheet metal and wood. They are highly practical as they allow easy, problem-free tapping of the hole. HD screws, on the other hand, are designed for more robust applications. In addition to sheet metal and wood, they can also be used on concrete, ensuring a secure and strong fixing even on harder surfaces.