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.