High Hardness: The hex screwdriver sleeve is made of 40CR tool steel. 40CR has strong comprehensive mechanical properties, toughness, durability and good wear resistance. Polished, corrosion resistant and sandblasted to make it more durable. Easy to use: this nut driver kit comes with a storage organizer, and the storage organizer and nut driver are marked with obvious sizes, so you can quickly find the socket you need. Wide range of applications: 1/4'' hex driver socket is suitable for installation in these tools hexagonal, such as air screwdrivers, socket wrenches, electric screwdrivers, air drills, electric drills, hand screwdrivers, etc., widely used in woodworking and auto parts, engineering, machinery maintenance, etc. Easy to use: The non-magnetic combination kit adopts universal 1/4'' hexagonal handle, easy to install and disassemble, and it is not easy to fall off during use . waterproof, sturdy and flexible. Various Sizes: This hex socket includes different sizes, 7 pieces of drive nuts (metric): 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, 12mm; 7 Pieces of Electric Screwdriver Bits (Inch): 3/16", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16". Different sizes of hex drill bit sets are enough to meet your daily needs. Note: The data is manual measurement, please allow 1-151cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.