Size and quantity - M4 x 20 mm (100 pieces) | Footprint: PH2 The A2 stainless steel screw for interior and exterior - Our screws comply with the standard metric system. It is not easy to slip during the installation process. it can be directly locked into wood or soft metal, aluminum or even plastic materials. It has high strength, does not deform and is not easy to break. Flat head and cross slot: flat head design, ideal for use in confined areas where the head must be aligned or below the surface. Standard cross slot, smooth and burr-free, it is not easy to slip in the installation process, you can install it quickly. Sharp thread - The screws have a deep thread design, which fully guarantees the fast work of the screw during use, improves work efficiency and has sufficient holding force, which can help to fix and repair well. Sheet metal screws feature a similar shape to that of wood screws but in a different material which is much more resistant and has a specific tip for sheet metal. It is advisable to pre-drill or make a pronounced mark with a needle to screw them in more easily.