1.Wide Application: The kit includes screws, nuts and washers of M2 M3 M4 M5 models in different sizes which can be widely used in DIY to fully meet the varied needs of professionals, hobbyists, homeowners, repairers, etc. So many screws serve as good substitutes for damaged or missed screws.^2.Standard Metric System: Our M2 M3 M4 M5 screws and nuts agree with the standard metric system and the average error is less than 0.01mm. Nuts and flat washers help expand contact space and reduce pressure to protect screws and parts. The compact and uniform strength thread is not easy to deform or slip during the rolling and installation process.^3.Superior Quality: Made from high quality stainless steel. The sturdy screw set represents good corrosion resistance in harsh environments such as high temperature, cold weather and high humidity areas. They are perfectly resistant to rust and oxidation, which allows a long service life and prolongs the service life.^4.Long Term Storage and Convenient: M2 M3 M4 M5 hexagon socket head cap screws, nuts, washers and 4 screw wrenches (880 pcs in total) are packed in a durable and sturdy case. In addition, for more convenience, the box is divided into multiple tiles to store respectively all types of corresponding parts in order to avoid tangling or loss of screws during use.^