Overview The Black Box RM409 is a hardware pack designed to secure equipment to M5 standard rails, commonly found in server racks and audio-visual setups. It includes 20 cage nuts and 20 screws, each coated with zinc to prevent rust and wear, ensuring long-lasting reliability. This pack weighs just 0.406 lb (0.18 kg), making it easy to carry while providing durable components for frequent installations. Key features Includes 20 cage nuts and 20 screws matched for M5-threaded rails, simplifying rack assembly and maintenance Zinc coating on all pieces protects against corrosion and thread stripping, extending hardware lifespan Cage nuts clip securely into square-holed rails, providing a stable and vibration-resistant hold for mounted equipment Lightweight pack size makes it convenient for technicians and installers to carry in tool bags or kits Suitable for mounting servers, switches, patch panels, amplifiers, and other rack-mounted devices Key specs Thread type: M5 Quantity: 20 cage nuts and 20 screws Coating: Zinc for corrosion resistance Weight: 0.406 lb (0.18 kg) Compatibility: Standard square-holed rails for rack equipment Ideal uses and environments This hardware pack is well suited for network installers setting up or maintaining server racks, audio-visual technicians mounting professional gear, and home lab enthusiasts organizing their equipment. Its corrosion-resistant finish and matched components make it a reliable choice for both new rack builds and replacing worn fasteners during equipment moves or upgrades.