Product features: - Material: 304 stainless steel - Resistant to high temperatures and corrosion - Smooth surface and edges, no rust - Protects parts from damage caused by tightening - Insulates, reduces friction, and prevents leaks - Ideal for home repairs, mechanical appliances, industries, cars, boats, generators, factories, etc. Note: Due to manual measurement, the size may have an error of 1-2 mm.