This rack can hold 3 LGX fiber optic adapter panels or 3 LGX-MPO boxes. When you need to hold MPO boxes, you need to independently remove the space fusion disc. ^^ There are cable entrances and exits at both the front and back ends of the rack, which helps to minimize cable accumulation to the greatest extent possible. ^^ Using high-quality steel with a thickness of 1.2 mm, sturdy, durable, corrosion-resistant. ^^ Suitable for installing all standard 19inch wide racks and cabinets.