Buy high-quality 15.8mm x 15.8mm steel box section from metals4U, promising industry-leading quality and service. Order before 2pm and expect same-day dispatch and order in bulk to make the most of our generous bulk discounts. Find product information and specifications on this page and ensure you order a 15.8mm x 15.8mm steel box section that meets your construction requirements. Our 15.8mm x 15.8mm steel box section is available in 3 metres or 6 metres, but if you’re looking for a specific measurement, you can use our free custom cutting service. Get the job done quickly and efficiently with metals4U.