Product details: Compatible with wide sizes of M3 - M18 mm threads; The included drill is HSS (high speed tool steel). Can be used with high speed rotations; How to use: 1. Apply lubricant to the gap between broken bolts and female threads; 2. Use the included drill blade to drill holes 3. Apply a small amount of machine oil to the drilled holes. to the left (counter). 4. After the extractor is untightened, please be careful not to break. If you turn it counterclockwise direction, the broken screws will loosen and the broken bolts will come out from the female screw, so the extractor will be completely removed 5. The bolts will be scattered by pliers, vice, etc. and screw the extractor in the clockwise direction. and broken screws. Please note that due to the thickness of the wall may be thinner, the extractor may expand the screw and make it difficult to unplug.