Alloy tool box used externally bonded multilayer silver 9mm Brushed aluminum foil, aluminum foil with thickness of 0.4mm. The use of aluminum alloy parts, box embedded on both sides of the two handcuffs. Box 30 times the internal use of PE, in accordance with equipment size, milling out of shape. Box features: Strong, wear-resistant, easy to transport. Can also be designed according to customer requirements, and processing.