Set of 580 Metal washers: This lot contains 580 metal washers. They are all made of solid and durable stainless steel. Each lot includes 9 kinds of most used flat washers to meet all your needs. The size of these goes from M2-M12 with several of the same size and thickness varies between 0.3 mm and 2.2 mm. A plastic storage box is included with 9 compartments / sections to stay organized. 9 steel washer sizes: This high quality stainless steel round assortment contains 9 kinds of external, internal and thick diameter. 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 seal are sorted by compartments. A sizes guide is available on the lid. Solid steel: The surface of this type of puck is smooth, avoiding injury when used. Stainless steel is robust, solid and durable and will not break easily. It is also anti-rust and anti-erosion. Use this type of wedge washer to distribute the pressure of the mounting elements such as bolts and screws to protect the surfaces of the assembly parts. They also reduce friction, prevents leaks and do not loosen. Multi-uses: When you do not use them, store these flat washers in your box, on your shelf, in your toolbox or drawer. This lot can be used at home, in a hangar or work. Use this sealing washer with the screws, bolts, nuts of the same size when you build your terraces, fences, furniture such as your bed, table, appliances, personal projects, repair of instruments, computers. Not suitable for children under 3 years old. Possibility of choking.