720 Pcs Nuts And Bolts Assortment Kit, M3 M4 M5 Carbon Steel, With Storage Case Premium Quality: These assorted screws with nuts and washers are made of outstanding Carbon Steel material with good corrosion resistance and high hardness, which is sturdy and durable, rust-resistant, and not easy to break, more solid. Easy to Use: The Carbon Steel screws with nuts and washers an increase of the contact surface, which reduces pressure and protects small parts and screws.to easily and quickly replace a lost or broken set screw. Easy to Store: All kinds of nuts and bolts assortment kits are arranged in the storage box with several handy compartments, with detail information sheet about the sizes of different screws, nuts and flat washers. Easy to store and at hand when needed. Wide Applications: Widely used in the repair and installation of many occasions, such as precision machinery, instruments, electronic products, household appliances, communication products, etc; Also can be use for a storage box fixing component, industrial and construction fasteners. What You Will Get: The assorted nuts and bolts feature a selection of 12 different screw, nut and washer sizes in a variety of quantities. The mixed screws include screws, nuts and washers of m3/m4/m5, which is enough for your daily use, and can be used for a number of different projects.