· High quality carbon steel. Solid and durable. · Feature a Philips truss-head. Coated with matte-black zinc chromate plating that is resistant to corrosion. · Pre-installed nylon washers are available to avoid scratching equipment. · Widely used for mounting rack server cabinets, server shelves, A/V device enclosures, and etc. · Include 100 pieces of screws and washers.