Product Description: Quantity: one set UPGRADED VERSION - Apart 20 different size drill bits and extractors. So the product is compatible with screws/drill bits/bolts of any size, such as square head screws, hex bolts, wood screws, etc. QUALITY MATERIAL - Made of steel Alloyed with high speed 4341 grade, the tools are strong, durable and have high strength. And damaged screws can be easily removed, making your work more efficient. EASY TO USE - In just two simple steps, any stuck screws or bolts can be removed in seconds: Choose a bit 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 the tools so that the accessories are not easy to lose. Moreover, as the case is quite thin and light, 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 avoid injury.