1. quality material: The screw removal kit is made of strong and durable 4341 steel, ensuring hardness and strong torque. The surface is fully hardened to prevent rust and guarantee reliable, longlasting performance. 2. Easy to Use: Use a drill to make a deep hole in the screw head, selecting a drill bit smaller than the damaged screw. Then, insert the screwdriver counterclockwise into the damaged screw and remove it at low speed. The operation is convenient and easy, saving significant time and effort. 3. 5 Different Sizes: The screw extractor set includes 5 different sizes 4mm (suitable for 46mm screws), 4.5mm (suitable for 68mm screws), 6.5mm (suitable for 811mm screws), 7.5mm (suitable for 1114mm screws), 11mm (suitable for 1118mm screws), ensuring you have the right tool for every task. 4. Wide Application: With this lefthanded extractor set, you can remove sunken, worn, rusty, cracked, or corroded screws and bolts, as well as broken fasteners. It is suitable for screws or bolts of various sizes, making it ideal for construction, automotive, DIY, or industrial projects.