1、Stainless Steel Galvanized Material: These screws are made of stainless steel, with high strength and not easy to rust, galvanized can improve corrosion resistance. 2、Powerful Screw Tip: The tip of the self tapping screw can pierce dry wall, mainly used for dry wall in houses, buildings and offices, etc. 3、Cross Groove Design: The cross head is not easy to slip during the installation process, will not be deformed or broken, which can save working time. 4、Various Specifications: The kit contains screws of M3, M3.5 and M4 specifications, and the quantity is sufficient, which can be used and replaced at any time. 5、With Compartmental Storage Box: These self tapping screws are packed in a transparent box with compartments for easy sorting and carrying.