Fangrui Product Details High Qualitythese Lock Nuts Are Made Of High Quality Nylon And Sturdy 304 Stainless Steel, Has Great Corrosion Resistance, Waterproof, Rust-resistant. The Nylon Insert Helps The Nut To Lock Tighter And Resist Loosening. Size & Quantity180pcs Lock Nuts With Various Sizes In A Durable Transparent Box, It Contains 7 Sizes Selected For You, Includes: M3 X 60pcs, M4 X 35pcs, M5 X 30pcs, M6 X 25pcs, M8 X 15pcs, M10 X 10pcs, M12 X 5pcs. Anti-twistnylon Screw Nut Grips The Nylon Insert With A Thread To Prevent Loosening. To Stay Intact And Make It Practically Indestructible. Not Easy To Be Deformed And Damaged. Packingthese Lock Nut Kit Is Lightweight, Very Convenient To Carry; The Transparent Storage Box Is Durable Enough To Accommodate All Items Safely. Widely Usedwidely Used In Automobiles, Construction Machinery, Shipbuilding, Cabinets, Miners, Car Tires, Textile Machinery, Etc. Ideal For Daily Installing Or Fixing Furniture, Motors, Automobiles, Motorcycles, Etc.