Stud Extractor 20mm 3/4inch Drive 

●36mm External hexagon drive.
●Removes and installs studs without damage. 
●Works on screw without head, quick and easy to use, no damage to the stud. 
●Safe clamping due to 3 rollers.
●Stud screws can be screwed in or out without using counter nuts on the bolt.
●Also for extra long studs that will go through the through socket