I just received this package of  18-8 Stainless Steel Flat Washers and they fit the bill for my use with small machine screws and nuts, used where rusting is an issue. They have the Plain Finish look and meets DIN 125, M3 Hole Size, 3.2mm ID, 7mm OD, 0.5mm Nominal Thickness, (Pack of 100).  They will occasionally be used in securing electronic boards to enclosures and in some other applications involving beads and jewelry. I love em.