7 Sizes Nuts Assortment: Package includes 165 pieces lock nuts in 7 optional sizes, including 45 x M3, 35 x M4, 30 x M5, 30 x M6, 15 x M8, 10 x M10, 5 x M12, the valid combination is enough to meet your different demands. Quality Material: These hex nuts are made of 304 stainless steel, sturdy, durable, rust-proof, corrosion-resistant and oxidation-resistant, not easy to deform, you can use them with confidence. Excellent Tightness: These lock nuts comply with the standardized metric system, so they fit most bolts or screws. The precise thread makes the nut firmly lock the spindle even under vibration. Easy to sort: These self-locking nuts are well stored in a transparent storage box so that you are not bothered by sorting. In addition, the storage box gives you a perfect resolution for storing the nuts. Wide application: These stainless steel nuts are very practical against loosening caused by vibration, and they are very useful for daily life. You can use them for DIY or industry.