The one that fits tightly in the Allen socket. -Any real artisan or mechanic has a set of SAE and a set of Metric Allen keys.
8mm
Torx or Allen wrenches get more torque (pressure) on the bolt.
Usually a 1/8 Allen key
57rc
There may be an Allen wrench to turn the shaft when jammed. There is not normally any other wrench.
9mm Allen wrench
You need a torx type socket. If you use an Allen wrench...you will strip out the inside of the bolt.
I think that uses a 7mm Allen wrench.
7mm Allen wrench
I believe that is a 7mm Allen.
That is a 3/8 Allen.
You need 7/64".
use an Allen wrench not a socket or open or box wrench.
It would be a 14 or 17 mm wrench, not Allen key. Hardly any Asian cars use Allen keys.
There is no Allen wrench, I believe it is 14 mm open wrench.
3/8"
It should be a 7 mm Allen.