Save Effort The bolt remover removes broken or damaged screws, bolts and fasteners without any effort, improving work efficiency Advantage The screw extractor is made of high-quality materials, the overall heat treatment is strong and durable, convenient and efficient, and durable enough, black oxidation treatment, durable Package Comes in a storage box with 12pcs: 6 pcs for screw extractors (4.0mm / 4.5mm / 6.5mm / 7.5mm / 11.0mm / 15.0mm) and another 6 pcs for drills (3/32 " 1 / 8 " 3/16" 1/4 " 5/16" 3/8 "). Very convenient and practical to put your all these tools in place and carry them to anywhere. Application Suitable to remove any available terms such as bolts, screw and stud whose diameter varies from 4mm to 25mm. Necessity Whether your are a professional or hobbyist, you all can keep such a set of tool at home in case of any necessary situations.