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I believe that is a 3/8 Allen.
3/8 in.
A 3/8 Allen key.
Allen wrenches come in various sizes. There is no definitive information as to what size is needed to remove a brake caliber so you will need to match the wrench size to the best of your ability.
The front caliper on a 1995 Ram is requires a 3/8 inch Allen wrench to remove the bolts.
3/8 inch Allen wrench
Depending where it was built, a 3/8 Allen key or 15 mm regular wrench.
5/8 inch
I believe that would be a 3/8 Allen.
13 mm13 mm
7mm Allen wrench
The last one of those I worked on was 3/8 Allen key