1. Made of 304 stainless steel, it offers excellent corrosion and rust resistance, making it suitable for indoor and various outdoor environments 2. The open-ended spring washers create a mechanical lock through elastic tension and notches along the edges, effectively preventing bolts from loosening due to vibration 3. The set includes 9 common metric sizes M2, M2.5, M3, M4, M5, M6, M8, M10, and M12 to meet diverse maintenance and assembly needs 4. Packaged in a transparent, multi-compartment storage box with clear labels on the inner lid indicating specifications and quantities, facilitating quick identification and retrieval 5. The notches are smooth, with no visible burrs on the surface, minimizing the risk of damaging the surfaces of connected parts during installation and use 6. Material: 304 stainless steel
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