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 22 to 26.75 inches. This Sliding Rack Server Shelf provides you with flexibility to slide extend 16". 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 280lbs weight capacity. slide extend load bearing 80lbs