Improved version: In addition to 20 different sizes of drills and extractors. So this product is compatible with any size screw/drill/bolt, like lag screws, hex bolts, wood screws, etc. Premium Material: Made of high alloy steel high quality 4341 speed, the tool is strong, durable and strong. And damaged screws can be easily removed, making your work more efficient. Easy to use: Any stuck screw or bolt can be removed in seconds in just two simple steps: choose a drill bit smaller than the screw damaged, then use the same size extractor and twist in the opposite direction to remove the screws. Portable: Comes with a gadget storage box, making the accessories not easy to lose. In addition, because the case is very light and thin, it is easy to carry. Reminder: It is recommended to use a low-speed hand drill to remove damaged screws to avoid injury. Good quality product