Features: Make from 304 stainless steel materials, highly strength, corrosion and antirust, not easy to break. Thread is tight and force is uniform, it is not easy to deforms and slide during rolling and installation, it can bear greater loads, and it can ensure the stability of the installation. Hexagon nuts can make your installation more precise and fastens better, providing strong holding force and clamping force; washers can increase the contact area, distribute pressure, protect the nuts and bolts, and prolongs the use time. Widely used in household appliances, automobile assembly, product manufacturing, precisions machinery industry, electronic products, communication products, lamp, toy, maintenance and other fields. All key screws is stored in a clear storage box with compartments, is well organized, easy to carry and find. Specifications: Material: 304 stainless steel Box size: about 13x8x2cm/5.12x3.15x0.79inch Package Includes: 10Pcs 5x6mm 10Pcs 5x8mm 10Pcs 5x12mm 10Pcs 5x16mm 10Pcs 5x18mm 8pcs 5x20mm 8pcs 5x25mm 60Pcs 5mm Lock Washer 60Pcs 5mm Flat Washer 30Pcs 5mm Nuts note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.