SOLID STRUCTURE: The four corner joints are reinforced by welding to resist loads and deformations. Detachable mounting ears are to prevent damages during transportationFLIP LIPS DESIGN: Two ways to install the ears to the shelf body, lips up or lips down. Lips up to prevent the device from falling off, suitable for small devices, while the lips down is suitable for installing deeper devicesMAXIMUM AIRFLOW: Vented design speeds up the heat dissipation, keeping the equipment cool & prolonged. Cable tie holes are pre-drilledMULTI-USAGE: These rackmount shelves are ideal for various applications combined with 19” standard racks and cabinets, to hold IT devices, network routers, and stereo equipmentPACKAGE INCLUDE: You will receive 2 PCS of 1U 6” depth mini server rack shelves and relevant mounting screws & cage nuts