1U height: The design purpose of this rack is to accommodate 1U height server devices. This 1U vented server rack mount shelf is designed to fit virtually any 19in server rack and can accommodate an internal depth of 10in (25cm) for your data, IT, networking, or other non-rack mount equipment. Metal Material: This rack is made of metal material. The metal material endows the rack with sturdy and characteristics, which can effectively protect server equipment and supports a total weight of 44lbs/20kg making it the rack shelf solution for any environment. Suitable for cabinet installation: This rack is designed for installation in standard cabinets. Cabinets typically provide multiple vertical support slots, allowing the rack to be easily placed and fixed inside the cabinet. Heat dissipation and air circulation: 1U server cabinet metal racks usually have good heat dissipation and air circulation design. This is for the cooling of server equipment to that they can operate within a stable temperature for 19 inch cabinet rack note: Different batches may have slight color differences or differences in the actual product, which does not affect use. Material: Metal colour: Black Package Contents: 4 x 1U Server Rack Shelf with screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.