Rack Mount Screws:Conforms to the standard metric system, and the average error is less than 0.01 mm, ensuring the accurate and close cooperation of rack installation equipment | Premium Carbon Steel:Rack screws and lock nuts are made of carbon steel and plated with black nickel.Good oxidation resistance,super rust resistance and corrosion resistance can prolong the life of screws and nuts | Easy installation:The thread structure is compact, and the stress is uniform. The top of the screw is designed smoothly, and the thread is clean, accurate.Not easy to deform and slide. The deep and clear flat crosshead makes your work easier and faster | M6 Server Rack Screws Kit:This kit contains 45 square rack cage nuts, 45 rack mount screws and 45 black washers. non-toxic to ensure your use | Widely used:M6 rack mounting screw kit is suitable for installing all kinds of server rack hardware, which is generally compatible with most square-hole racks and cabinets, and is suitable for installing your rack-mounted server cabinets, A/V equipment housings, server brackets, etc