Chief Raxxess UNS1 Vented Universal Rack Tray Shelf for 19" Server Racks, with Bottom Slots for Mounting Non-Rack and Half-Rack Equipment Punched shelf bottom can be used to attach non-rack and half-rack components and promotes good ventilation Designed for IT racks, music studio racks, and all standard 19" rack systems Made from Heavy 14 guage steel with ventilated bottom slots to properly secure equipment Depth: 10" / Height: 1.75" 1U / Width: 19" including mount panels with 17.25" useable space 20 lb capacity