Features: Removing broken or damaged screws, bolts and fasteners without any effort. Suitable to remove any available terms such as bolts, screw and stud whose diameter varies from 4mm to 25mm. Comes in a storage box with 12pcs: 6 pcs for screw extractors and another 6 pcs for drills. Very convenient and practical to put your all these tools in place and carry them to anywhere. Made of high quality material, durable enough for a long term use. Whether your are a professional or hobbyist, you all can keep such a set of tool at home in case of any necessary situations. Specification: Material: Steel Color: Shown as pictures Drill Bit Sizes: 3/32, 1/8, 3/16, 1/4, 5/16, 3/8 Screw Extractors(6Pcs): 1(Dia: 4.0mm/0.15) for 4-6mm/0.15-0.23 2(Dia: 4.5mm/0.17) for 6-8mm/0.23-0.31 3(Dia: 6.5mm/0.25) for 8-11mm/0.31-0.43 4(Dia: 7.5mm/0.29) for 11-14mm/0.43-0.55 5(Dia: 11.0mm/0.43) for 14-18mm/0.55-0.70 6(Dia: 15.0mm/0.59) for 18-25mm/0.70-0.98 Storage Box Size: Approx. 19x10x4.5cm/7.48x3.93x1.77 Weight: Approx. 410g Packing List: 1 x 6Pcs Screw Extractors 1 x 6Pcs Drills 1 x Plastic Storage Box