Precision Marshall’s huge inventory of ground flat stock features more than 4,000 distinct items which provide coverage for virtually every known ground flat stock application. Standard grades of material available include O-1, A-2, D-2, S-7, H-13, 4142 Pre-Hard, C-1018 and 410, 420 and 440C stainless steel. Many grades are available as “Regular” or “Oversize’ tolerances.