1. High quality materials Made of stainless steel, high hardness, not easy to break, durable. Standard cross slot, uniform force, easy to lock, not easy to slip, more convenient and quick to use. There are many different lengths of screws that you can use for a variety of purposes. 2. 18 sizes to choose from A large assortment of the 18 most used sizes is provided to meet your needs. Ideal for home, office, work, garage, business and industrial applications. 3. Anti-corrosion surface Black zinc plated surface is one of the highest forms of corrosion resistant metals which last a very long time, can withstand weather and temperature fluctuations, including if positioned in environments extremely humid. 4. Easy to store You can also get a plastic sorting box where you can sort, organize and remove the screws. The box is easy to transport and store, and can also be used as a storage place for other small items. 5. Multifunction repair Large used to repair glasses, sunglasses, computers, cellphones, small electronics, clocks, watches and other device with small screws. It is very convenient for you to repair with a mini multi-function screwdriver.