Straight groovesquare screw extractor: solves the problem of being unable to disassemble damaged screws Five models can handle metric 3 / 16inch to 5 / 8inch studs, covering most screw sizes to solve bolt damage issue All questions should not be missed Applicable screws: Crossed head screws, inner hexagonal screws, outer hexagonal bolts, flat screws, As long as the screw diameter is within the aboverange, it can be used Straightgroove: After drilling, quickly clamp the screw inside, making it easy to remove the screw Square clamping: The tail is square, making it for the faucet to clamp and manually screwout screws Threadrange:: 4-M62.2-4.6MM drill bit; 2 M6-8 3.2-4.6MM drill bit; NO.3 8-M10~3.7-6.3MM; NO.4 M10-M16~5.5-7.8MM; 5 M14-18~6.4-0.4MM, Manufacturer: SHANGYAKEJI