High-quality material: Made of high-quality copper, corrosion-resistant, anti-aging, with good electrical and thermal conductivity, can be used for a long time.Product advantages: high-quality copper material, stable structure, the product has a certain degree of softness, while the copper washer has a curved edge design on one side and a flat surface on the other side, which can reduce the friction between the screw and the nut to prevent loosening or loosening under pressure, which is more conducive to increasing the tightening effect and improving the sealing performance when tightening.Scope of useThe product can be widely suitable for a variety of electrical connections in factories and homes, such as ships, electrical appliances, cars, motorcycles, a variety of machinery, with outstanding sealing effect.Easy to Store: All copper washers are housed in a sturdy plastic case for easy storage and access, allowing you to easily access and replace damaged and lost parts, as well as prevent accidental swallowing and scratching by children.