Suitable for electric screwdrivers, hand screwdrivers, electric drills, air drills and other tools.But please note that it cannot be used for drills and electric wrenches. 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, This 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. 10 different sizes of inner bit, which can meet your various needs. Equipped with an upgraded strong 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., Manufacturer: PURPLELILY