AC Infinity Carbon Steel M6 Rack Screws, Nylon Washers, and Cage Nuts. 50-piece set for equipment server racks, enclosures, and cabinets. Phillips truss-head screws with self-guiding Pilot Point design. High-grade carbon steel construction prevents stripping. Corrosion and rust-resistant black zinc chromate plating. Pre-installed nylon washers to avoid scratching equipment. 50 piece screw, washer, and cage nut set; M6 threaded, 3/4 long.