Professional Tools: This set of screw extractors will quickly and easily remove broken screws, pipes, bolts and studs. Suitable compatible with pipe thread correction. Ideal compatible with home use and professional technician, long service life. Different sizes: there are a total of 6 different sized extractors compatible with diameter screws. Materials of High Quality: These screw extractors made of high quality chrome vanadium steel which can drill on most screws., have a long service life. A few drill bits can also be used to drill holes in wood, metal, plastic, brick and wall etc. Easy to use: first drill a hole in the center of the screw broken with a suitable drill, then use a suitable extractor to remove the screws. Drilling diameters and recommended extraction diameters of broken screws etched on the housing. Notes - You can use a tap handle that holds the extractor firmly; compatible with the large puller, you can use an adjustable wrench. You can use an adjustable wrench to hold the extractor firmly while removing the screw. When near power tools, wear eye protection and protective clothing. Specification: Model: Material: Chrome vanadium steel Weight: approx. 233g / 8.2oz Package List: 6 * Screw Extractors 1 * Storage Box Note:</ p> Do not oblique when using the key, you should be compatible withced into the unicompatible withm. Note: manual measurement data, please allow 1-6cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.