Steel is not like autocad it's made to permissible tolerances not absolute sizes. when you ask a steel stockist you need to ask for 25mm or 1" and they'll see what they have in stock on the database your only talking to an office worker not the guy in the ware house some times they will have 3 ton of 1" x 16 gauge and no 25mm x 1.5 box. Also if you just ask for 'box section' you will get HRC/HRS or 'black' which will be 2.5mm thick, what you want is ERW which is a better quality material and has square sides to work with. Otherwise it's like walking into B&Q and asking for paint...
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