Universally compatible 19 inch 1U rack mount shelves will fit into any standard server rack. This line of tray is designed with flexibility in mind. The depth can be adjusted from 30 to 34 inches. It has slotted venting to reduce the possibility of overheating. Made of high quality cold rolled steel with a powder coated finish that protects them from rust and corrosion. Already assembled. premium quality craftsmanship, yet heavy duty up to 300Lbs weight capacity.