【7 Sizes】The lock washers come in 7 different sizes to fit different bolt and nut diameters: M3, M4, M5, M6, M8, M10, and M12. 【High Quality Material】The metal washers are made of high quality 304 stainless steel, which is corrosion resistant, rust resistant, and wear resistant, durable and reliable. 【Strong Biting Force】The washers have an eight-pointed star shape with internal teeth that can bite into the surface of the bolt or nut to prevent loosening and ensure stable locking. 【Easy to Use】Quick lock washers are easy to use, simply place the washers between the bolt or nut and the surface to be fastened to increase friction and tension. 【Large 【Application】270pcs 304 stainless steel star washers, ideal for DIY projects, repairs, or construction. They can be used for machinery, furniture, electrical appliances, electronic equipment, automobiles, and sports equipment. Features: These washers are made of 304 stainless steel, a sturdy and durable material that resists corrosion, rust,