【High Quality Stainless Steel Screws】The self-locking nut set made of high quality 304 stainless steel, which has the characteristics of corrosion resistance, oxidation resistance, rust resistance, high hardness and high temperature resistance. It complies with DIN912 standard, can work normally under extreme weather conditions and has a long service life.【Combination Set】 Nut set, a total of 520, including M3 M4 M5 M6 M8 M10 M12 nylon self-locking nuts and M2 M2.5 M3 M4 M5 M6 M8 hex nuts. At the same time, a storage box and tweezers can meet the basic needs of different groups of people in home life.【Fine Production, High Fit】 The nut kit made by machinery, with deep and neat threads, uniform force, not easy to slip, parts without burrs, stable and durable, high quality, precise fit, easier to complete various crafts.【Wide Use】 The nut kits can be widely used in home equipment and office equipment, ship assembly and other machinery industries, automobile and motorcycle maintenance, and DIY inventions! It can also be used for storage box fixing parts, industrial and construction fasteners. Ideal for use in small spaces where the head needs to be flush or below the surface.【Safe Storage】The nut kit is safely and neatly placed in a transparent box, which can clearly classify and place self-locking nuts and hex nuts. At the same time, the label paper of the corresponding model is affixed to the box, which can be more intuitive and clear. Find the tools you need.Number of parts delivered: 520 pieces.