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Kusonkey drill out Screw Extractor Set use for stripping a bolt or screw, they will save you from tons of frustration on stripped screws. Specification 1st bit has a drill size of 2.8mm and extractor size of 2.5mm minimum. (Diameter of 6.4mm.) 2nd bit has a drill size of 3.2mm and extractor size of 3.5mm minimum. (Diameter of 6.4mm.) 3rd bit has a drill size of 4.2mm and extractor size of 3.6 mm minimum. (Diameter of 6.4mm.) 4th bit has a drill size of 6.0mm and extractor size of 5.2mm minimum. (Diameter of 8.8mm.) How to Use Use the drill side to drill into the top a bit to allow the extractor to get a grip. (Burnish) Your drill should be moving the bit counterclockwise during this process. Then you switch the bit over and use the extractor (Spiral) side to remove the screw-bolt. Your drill should be moving the bit counterclockwise during this process as well. Package included 4 x Screw Extractors 1 x Plastic Black Box