HIGH-QUALITY STAINLESS STEEL AND NYLON: The hex lock nuts made of high-quality nylon and A2-70 stainless steel, making them sturdy, waterproof, rust-resistant. The nylon insert helps the nut to lock tighter and resist loosening. MORE SIZES FOR CHOOSING: Equipped with 8 sizes locknut to meet more needs, which is more fully equipped than most of the other locknut kits, including M3 M4 M5 M6 M8 M10 M12. DURABLE ASSORTMENT BOX: Individual organiser compartments are designed for easy-storing. The all-round transparent box makes it easy to see items inside even when stacked. Very strong and will not open during delivery. MULTIPLE USAGE: The locking nuts can be used for screwing on to bolts, as well as threaded rods and cap screws. Ideal for daily installing or fixing furniture, motors, automobiles, motorcycles, etc. Specification: Color: Silver Material: Stainless Steel Size: M3, M4, M5, M6, M8, M10, M12 Quantity x Diameter 45 PCS x M3 35 PCS x M4 30 PCS x M5 30 PCS x M6 15 PCS x M8 10 PCS