High-quality material: All kinds of hexagon screw bolts and nuts and washers set are made of high-quality carbon steel material with edges, strong, corrosion-resistant, rust-proof, not easy to break, and durable. Easy to use: The surface of the inner hexagon screw is and burr-free, the thread is clear and firm, and it is easy to insert. The compact and strong uniform thread is not easy to deform and off during rolling and installation. Nuts and washers reduce stress and protect components and screws. [Convenient Storage]All hex bolts, nuts and flat washers set are packaged in a storage box, easy to use, find and carry. Avoid screws scattered or lost while in use. You can use nuts and washers for a more precise fit. Wide range of uses: suitable for furniture repair, mechanical instruments, electronic products, household appliances, DIY projects, communication equipment, robots, 3D printing equipment, food machinery, petrochemical industry, ship facilities, construction and other fields. Packing list: Our metric hex head screw bolt nut washer set includes M2, M3, , M5 size bolts and matching nuts and washers, about 1225 parts in total, meeting different needs, it is a must-have hand tool for families. Colour:black Material:steel Package Contents: 1 x Hex Button Head Cap Screws Bolts Nuts Washers Assortment Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.