1. Stainless Steel M2.5, M3, M4, M5, M6, M8 Tooth Lock Washers Gasket Washers Washer Sanitation Kit. 2.Made of high quality 304 stainless steel, corrosion resistant, strong and durable. 3. Come in 7 most used sizes: M2.5, M3, M4, M5, M6, M8 4.Packed in a plastic box: Organized by size in a transparent storage case for quick access and protection. 5.Perfect for electrical connections on household and commercial appliances, automotive and marine uses. Product Name: External Serrated Lock Washer Product Material: 304 Stainless Steel Product Quantity: 300pcs Surface Treatment: Natural Color Product Usage: Tooth-shaped composite gaskets are especially suitable for high temperature, high pressure and alternating working conditions. It is an ideal substitute for traditional metal gaskets on the flange of heat exchanger flange joints, vessels and reactors. Suitable for high temperature and high pressure parts, strong corrosion resistance, stable and reliable sealing effect. Box size: 125 * 65 * 22mm Product weight: about 60g / box Package includes: m2.5: 50pcs m3: 100pcs m4: 50pcs m5: 50pcs m6: 25pcs m8: 25pcs Note: It does not include other things, the color is based on the first picture, and the other pictures only show the effect. Due to the differences between different monitors, the picture may not reflect the actual color of the item. . due to manual measurement. Please allow the deviation. Thank you!