Heavy-Duty Load Capacity: Made of SPCC cold-rolled steel, this 1U rack mount shelf supports up to 110 lbs, ideal for heavy equipment like servers, UPS units, NAS, and amplifiers Universal 19 Fit: This sliding server rack shelf compatible with all 19-inch 4-post racks and cabinets. Fixed shelf depth of 21.7, with adjustable mounting depth from 21.7 to 35.4 Maximize Ventilation: Perforated design ensures consistent airflow, helping prevent overheating in IT and AV setups Versatile Installation: Mount normally or upside down to save space- ideal for network, audio/video, or home lab environments Complete Installation Kit: Includes mounting screws (for square and threaded holes), cable ties, and anti-slip stops for easy setup and cable management