High Quality --- The screw extractor set is made of high quality chrome vanadium steel,duable and easy to use,and using this tool will quickly and easily remove broken screws, pipes, bolts, and studs. With Storage Box--- We have equipped these screw extractors with a small storage box, which can protect these screw extractors very well, so that you no longer have to worry about where your gadgets are hiding, which is very convenient. Easy to Use --- The screw extractor is easy to operate 2 simple steps can remove all jammed screws/bolts in a few seconds. Only one drill bit is needed, no other tools are needed. Choose a drill bit smaller than the damaged screw to easily remove the screw. Wide Application --- The screw extractor set is a universal type and can be used with most drill bits and most sizes of screws or bolts. Our screw extractor can remove common sizes of peeled or damaged screws. Specification: Condition: 100% Brand New Model: R-T-Q06 Material:Chrome Vanadium Steel Weight: Approx. 233g / 8.2oz Diameter Length Application Range 4.0mm/0.2in 5.1cm/2.0in 3-6mm 4.5mm/0.2in 5.8cm/2.3in 6-8mm 6.5mm/0.3in 6.6cm/2.6in 8-11mm 7.5mm/0.3in 7.5cm/3.0in 11-14mm 11.0mm/0.4in 8.4cm/3.3in 14-18mm 12.0mm/0.5in 9cm/3.5in 18-20mm Package List: 6 * Screw Extractors 1 * Storage Box Note: Do not obliquewhen using the wrench , you should be force to uniform.