AC Infinity Carbon Steel 12/24 Rack Screws and Nylon Washers. 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 and washer set; 12-24 threaded, 3/4 long.