Feature:1. Made of pure copper material, not easy to corrode, not easy to be damp and not easy to oxidize.2. The thread is deep and neat and clear, and the force is even and not easy to slip.3. The surface is flat and smoothly without burrs, with great workmanship and has a long service life.4. There are multiple specifications of M3, M4, M5, M6 to choose from.5. With 50pcs nuts, can meet your use and replacement needs, very practically.Specification:Item Type: Self-Locking NutMaterial: Pure copperSpecificationPitcheshmM3(approx.)0.5mm / 0.02in6.2mm / 0.2in5.5mm / 0.2in3.55mm / 0.1in2.6mm / 0.1inM4(approx.)0.7mm / 0.03in7.8mm / 0.3in7.0mm / 0.3in4.4mm / 0.2in3.4mm / 0.1inM5(approx.)0.8mm / 0.03in9.05mm / 0.4in8.0mm / 0.3in5.0mm / 0.2in4.0mm / 0.2inM6(approx.)1.0mm / 0.04in11.45mm / 0.5in10mm / 0.4in6.25mm / 0.2in5.2mm / 0.2in.Package List:50 x Self-Locking Nut