This category contains site of job shops and manufacturers that specialize in fabricating parts out of sheetmetal and do little if anything in the way of drilling or turning to produce their end products. The operations they perform are, on the whole, confined to cutting, bending, stamping, and, quite often, painting or otherwise finishing the material they work with -- even though they do sometimes also produce tubular frames either in addition to or for incorporation into the enclosures they make.
Note: There is a subtle but important difference between sites in this category and those indexed in the Metal Fabricators one. Firms listed there are involved in producing products of a less than usual -- and more than likely advanced and complex -- form that requires something more than general machining. In turn, their end products will differ significantly from anything that can be classified, in relative terms at least, as a flat or shaped sheet.