Find half inch box section that delivers on quality and value from metals4U. Our 12.7mm x 12.7mm x 1.2mm mild steel box section has excellent weldability and machinability; you can find all the important information about our product below. There is no minimum purchase, and we offer a custom-cutting service, so you can order exactly what you need. We are the UK’s leading online metal supplier, trusted by tradespeople, contractors, and keen hobbyists to provide dependable construction materials. Order before 2pm and your order will be dispatched on the same day. Working on a big project? Order in bulk to take advantage of site-wide discounts.