improved VERSION - apart from 20 drills and extractors of different sizes. So the product is compatible with screws/drills/bolts of any size, such as square head screws, hexagonal bolts, wood screws, etc. quality material - made of quality 4341 high speed alloy steel, the tools are strong, durable and have high strength. And the damaged screws can be easily removed, making your work more efficient. easy operation - in just two simple steps, all stuck screws or bolts can be removed in seconds: choose a drill bit smaller than the damaged screw, and then, use an extractor of the same size and rotate itIn the opposite direction to remove the screw. PORTABLE - comes with a small storage box for tools so accessories are not easy to lose. In addition, as the case is quite thin and light, it is easy to carry. warm tips - it is highly recommended to use low speed electric hand drill to remove damaged screws so as to avoid injury. made of strong and Durable alloy suitable for high speed revolution. Easily remove broken or rusted screws. Multiple size drills and extractors of different sizes offer several choices. An appropriate size will make removal much easier. practical storage box ADP, mouthpiece, each drill and extractor have their slots. Organization clear, compact and light to carry. delivery quantity: 1 set (22 piece) lucky meet