580 PCS METAL WASHER SET: This set contains 580 metal washers. They are all made of strong and durable stainless steel. Each set includes 9 types of the most commonly used flat washers to meet all your needs. These washers range in size from M2 to M12, with many in the same size, and their thickness varies between 0.3 mm and 2.2 mm. A plastic storage box is included with 9 compartments/sections to help you organize. 9 SIZES OF STEEL WASHERS: This assortment of high-quality stainless steel washers contains 9 types of different outer diameters, inner diameters, and thicknesses. M2: 4.9 x 2.1 x 0.3 mm; M2.5: 4.8 x 3.1 x 0.5 mm; M3: 6.9 x 3 x 0.4 mm; M4: 8.8 x 3.6 x 0.6 mm; M5: 9.5 x 4.8 x 0.8 mm; M6: 11 x 6 x 1.3 mm; M8: 15 x 8.2 x 1.1 mm; M10: 19 x 10 x 1.6 mm and M12: 23 x 13 x 2.2 mm. All these types of metal gaskets are categorized by compartments. A size guide is available on the cover. SOLID STEEL: The surface of this type of hinge washer is smooth, which prevents injuries during