Fiber distribution boxes are typically made of metal or plastic and come in a variety of sizes, depending on the number of fibers they are designed to accommodate. The material should be impervious to water, dust, and other environmental factors. Aluminum and stainless steel are common choices for metal distribution boxes. Metal enclosures excel in harsh environments, providing. Fiber Optic Distribution Box makes of stainless steel or cold-rolled steel with electrostatics plastic-spray surface: excellent waterproof and dustproof performance. The front of the box has a clear. • Enclosure: The enclosure is the outer shell of the FDB, typically made from durable materials such as ABS, SMC, or metal.