【Packing List】We provide 20 M3 stainless steel spring washers, and you can choose the washers according to the size of the bolt. 【High-Quality Material】The spring washer is made of high-quality A2 V2A stainless steel, which has a smooth surface and is resistant to rust and deformation. The spring washers offer excellent corrosion resistance, suitable for outdoor and humid environments. They can withstand daily wear and tear and ensure a long service life. 【Practical Features】All metric spring washers have left-hand spirals. This prevents them from loosening clockwise due to vibration. The asymmetrical serrated edge grips unhardened screws and nuts when tightened, providing a firmer hold than wave washers, but only for straight thread applications. 【Easy Installation】DIN 127 Type B washers are grooved and spirally bent. They generate an elastic force between the fastener head and the base material, pressing the washer firmly against the fastener and the thread against the nut. This increases friction and resistance to rotation. 【Wide Applicability】Stainless steel lock washers are used in light industry, chemical, metallurgical, construction, shipbuilding, automotive, electrical, and aviation. They are also used in motorcycles, fences, furniture, renovation, decoration, outdoor installations, and DIY projects.