UPGRADED VERSION - Apart from 20 different size drill bits and extractors. Therefore, the product is compatible with any size screws/drills/bolts, such as square screws, hex screws, wood screws, etc. QUALITY MATERIAL - Made of steel alloyed with high speed grade 4341 tools are strong, durable and have high strength. And damaged screws can be easily removed, making your work more efficient. EASY TO USE - Just two simple steps can remove any stuck screws or bolts in seconds: Choose a drill bit smaller than the damaged one, then use a puller of the same size and rotate it in the opposite direction to remove the screw. PORTABLE - Comes with a small tool storage box, so that the accessories are not easy to lose. In addition, since the case is quite thin and lightweight, it is easy to carry. WARM TIPS - It is highly recommended to use the electric hand drill at low speed to remove damaged screws to avoid injury.