304 Stainless Steel, Sturdy and Durable: Made of high-quality 304 stainless steel, this M3 nut set features fine workmanship. Resistant to deformation and breakage, it is anti-corrosion, rust-proof, high-strength, hard, and provides long-lasting durability and stability. Anti-shedding Nylon Design: The nylon insert in the nut creates friction with the thread. This prevents loosening due to vibration and shock and ensures a snug fit. Self-locking Nuts: M3 nuts are used with bolts and screws to assemble and fasten parts. They prevent accidental loosening of the screw and, thanks to their strong anti-twist function, provide secure fastening, increased safety and stability. Wide range of applications: Suitable for fixing instrument and equipment parts, connecting pipes and components, furniture decoration, automobile repair, mechanical engineering, electronics, household appliances, communication products, handicrafts, construction, etc. Black design: Self-locking nuts are the ideal choice for applications where machines, vehicles or equipment are subject to constant movement or external forces. Their elegant and sleek black design fits perfectly with all applications and equipment. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.