We are the UK’s leading online metal supplier, delivering quality and service you can trust. With excellent weldability and machinability, you can use our 30mm x 30mm steel box section for a range of different applications. You can find any additional product information you need at the bottom of the page. Buy 3 metres or 6 metres of 30mm x 30mm x 3mm mild steel box section for a great price, or use our free custom cutting if you’re looking for a specific measurement. Looking to finish a job quickly? Any orders placed before 2pm are dispatched on the same day.