Premium Material: A variety of hex bolt, nut, and washer sets are made of excellent alloy steel with smooth edges, which are sturdy, corrosion-resistant, and rust-proof, not easy to break, and durable. Easy to Use: The surface of the hexagon socket screws is smooth and burr-free, the thread is clear and firm, and it is easy to insert. The compact and uniform screw thread is not easy to deform and slip during rolling and installation. The nuts and washers can reduce stress and protect the parts and bolts. Easy Storage: All hex bolt, nut, and washer sets are packed in a storage box, which is easy to use, find, and carry. Prevent screws from being scattered or lost during use. You can use nuts and washers for more precise installation. Widely Used: Suitable for furniture repair, mechanical instruments, electronic products, household appliances, DIY projects, communication equipment, petrochemical industry, marine equipment, automotive and marine applications where the power source has a threaded/bolted connection. Package Content: Our metric hex bolt washer assortment set includes M2, M3, M4 size bolts with matching nuts and washers, about 1080pcs in total, meet different needs, is a must-have family hand tool.