Allen keys are hexagonal. The shape is a hexagon (6 sided figure).
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Hexagon
a hexagon
hexagon
If it stays on your face, it fits.
the general shape of mainland France fits roughly in an hexagon.
Hexagon
a hexagon
hexagon
Hexagon
6-sided is hexagon
To fasten and unfasten Allen screws and bolts. These fasteners have a hexagonal slot in the top into which the Allen wrench or key fits.
To determine the size of the rounded Allen wrench needed for the task, measure the diameter of the screw head or the hole it fits into. Match this measurement to the corresponding Allen wrench size.
I believe that's a 5/16 Allen.
whatever one fits, some are torx..
I believe that would be a 3/8 Allen wrench. -Very common on Dodge /Plym brakes.
this is my question, lol. my answer is 7 mm Allen wrench. fits like a glove!
Buy a MM Allen set and then you can't go wrong.