Features: Brand new and high quality 10 different sizes of inner hex bit, which can meet your various needs. This hex drill bit isselected by steel, which have stable performances,good wear resistance. The outer layer is wrapped with a green wear-resistant rubber heat shrinkable tube, which is waterproof. Equipped with an upgraded strong magnetic, which can easily grasp screws and small part and avoid falling. It can improve your work efficiency and will not damage the screws and the screwdriver head. Directly insert allen key bit into your tool, as long as it is inserted, it will not fall easily. You can easily use them on vehicles, bicycles, furniture, engineering, home appliances repairs, etc. Suitable for electric screwdrivers, hand screwdrivers, electric drills, air drills and other tools.But please note that it cannot be used for impact drills and electric wrenches. Specifications: Material:Steel Length:Approx.100mm/3.93inch Package Includes: 10Pcs Drill Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.