Size: M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20. With the slotted end or the three-hole end facing down, install the self-tapping screw sleeve on the front end of the tool, press it vertically against the workpiece, turn the wrench, and turn it into the bottom hole.
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