1. Covers 7 common metric sizes M3, M4, M5, M6, M8, M10, and M12 to meet the compatibility requirements of various bolts and nuts. 2. Features an external toothed edge design; once installed, the tooth tips engage with the contact surface, increasing frictional resistance and preventing bolts from loosening due to vibration. 3. Crafted from 304 stainless steel, it offers excellent corrosion and rust resistance, making it suitable for applications such as machinery, home repairs, and industrial assembly. 4. Packaged in a compartmentalized plastic box with foam padding to prevent mixing of parts and minimize vibration. 5. Material: 304 stainless steel 6. Weight: Approximately 77.3 g
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