1520Pcs Nuts And Bolts Assortment Kit Metric Screws With Washers Lock Washers M5 SCREWS ASSORTMENT KIT: Hex socket head cap fully threaded with 12 common sizes, including M3, M4, and M5, with lengths of 8mm, 12mm, 16mm, and 20mm respectively. Also includes flat washers for screws, lock washers, and nuts. REFUSE TO RUST: 1520Pcs set is constructed entirely of 304 stainless steel, Undergoes acid pickling and passivation treatment, Clean and non-greasy, Resistant to corrosion in wind and rain. WELL ORGANIZED: Sturdy plastic box with dual snap closures, Resistant to pressure and impact. Divided storage for easy identification, Suitable for repeated use as a toolbox. ICING ON THE CAKE: Includes matching Allen wrench and tweezers, Labeled for easy identification. BE PREPARED: Ideal for DIY projects, 3D printing, Mechanical screw, RC model screw replacement, Home decoration, Cabinet drawers, Industrial electronic maintenance, and small outdoor construction.