50 pieces pure copper anti-slip flange nut lock fasteners anti-loosening tool set (M4)

Features: 1. Made of pure copper, it is not easy to rust or corrode in a humid environment and has strong oxidation resistance. 2. The finish is fine, the thread is deep and neat and clear, and the force is uniform and difficult to slip. 3. This flange nut has a standard hexagon, more convenient to use, easy to install and tighten by hand. 4. The exterior is flat and smooth without burrs, excellent workmanship, strong and durable. 5. These pure copper flange nuts are anti-loosening, lockable, and anti-slip, so you can use them with confidence. Specifications: Item Type: Flange Nut Material: Pure Copper Specifications No Teeth Approx. h Approx. m Approx. s Approx. e Approx. c Approx. M3 0.5 mm / 0.02 in 4.5 mm / 0.2 in 3.5 mm / 0.1 in 5.5 mm / 0.22 in 6.25 mm / 0.25 in 7.4 mm / 0.3 in M4 0.7 mm / 0.03 in 5.5 mm / 0.22 in 4.1 mm / 0.2 in 7.0 mm / 0.28 in 7.9 mm / 0.31 in 9.35 mm / 0.37 in M5 0.8 mm / 0.03 in 6.0 mm / 0.24 in 5.0 mm / 0.2 in 8.0 mm / 0.31 in 8.9 mm / 0.4 in 10.9 mm / 0.43 in M6 1.0 mm / 0.04 in 6.5 mm / 0.3 in 5.5 mm / 0.22 inches 10 mm / 0.4 inches 11.4 mm / 0.45 inches 12.9 mm / 0.51 inches Package list: 50 nuts