This type of nylon loose-proof nut is made of fine quality 304 stainless steel, not easy to rust, corrosion resistance and long-lasting to use. Features: Stainless steel material will not release toxic substances, non-toxic environmental protection. Even in humid environment, stainless steel material will not rust easily, strong oxidation resistance. Stainless steel material, nickel and chromium element combination, acid and alkali resistance corrosion resistance. Stainless steel has a perfect surface gloss. Not easy to damage, high hardness. Specifications: Item type: Nut Material: 304 Stainless Steel Quantity: M-3~M5: 10PCS, M6~M14:5PCS Package weight: M-3: 5g/0.17ounces M-4: 10g/0.35ounces M5: 12g/0.42ounces M6: 10.5g/0.37ounces M-8: 22.5g/0.79ounces M-10: 51g/1.79ounces M12: 73g/2.57ounces M14: 114g/4.02ounces Package size: 1208020mm/4.723.140.78inches Package list: 5pcs*Nuts