These NavePoint 4 Post Rails were designed to fit any standard 4-post rack regardless of width. The depth can be adjusted between 16.13" and 33.25" and they take up 1U (1RU) of rack space. Perfect for supporting most Servers in a rack without the need to mount them directly. These rails are made from high quality Cold Rolled Steel with an Electro-static Powder Coated finish and can hold up to 110 pounds of equipment. The open design vents your equipment to reduce the possibility of overheating. Comes with necessary mounting hardware.