Features: Straight groovesquare broken 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. Threadrange: NO.1: 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. Square clamping: The tail is square, making it convenient for the faucet to clamp and manually screwout screws. Straightgroove: After drilling, quickly clamp the screw inside, making it easy to remove the screw. Applicable screws: Crossed head screws, inner hexagonal screws, outer hexagonal bolts, flat screws, etc. As long as the screw diameter is within the aboverange, it can be used Specifications: Length：approx 60mm/2.36in 68mm/2.68in 76mm/2.99in 78.5mm/ 3.09in 85.5mm/3.37in Material： Metal Quantity： 5pcs/set Package Includes: 5pcs Screw Extractor note: Due to the problems of lighting effects and shooting angle, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment