IMPROVED VERSION - Apart from 10 drill bits and extractors in different sizes, we also added 3 slotted screws, 3 Torx screws, 4 Phillips screws and 1 quick bit holder. So the product is compatible with screws/drills/bolts of any size, such as square head screws, hex bolts, wood screws, etc. QUALITY MATERIAL - Made of steel Alloyed with high speed 4341 quality, the tools are strong, durable and have high strength. And damaged screws can be easily removed, making your work more efficient. EASY OPERATION - In just two simple steps, any stuck screws or bolts can be removed in seconds: Choose a drill bit more smaller than the damaged screw, and then, use an extractor of the same size and rotate it in the opposite direction to remove the screw. PORTABLE - Comes with a small storage box for tools so that the accessories are not easy to lose. Additionally, 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 the damaged screws in order to to avoid injuries.