3/8 inch Allen socket 3/8 inch drive available at Bumber to Bumber Automotive stores
You need 3/8 Allen key.
You need a 12 mm wrench, not Allen key.
I just did my 2005 Ford Escape front brakes and the caliper was 7mm Allen and main holder is 18mm ...RRR Wis.'
For the front I believe a 15/16 socket will work. The rear I used a 7mm Allen wrench
The bleed screw on the calipers of brake systems are for 'bleeding' air out of the brake lines.
7mm Allen wrench
You need 3/8 Allen key.
7mm
It's 12 mm bolts, not Allen key.
I believe that will be a 7mm Allen key.
3/8" Allen wrench.
3/8"
3/8" Allen wrench
A 3/8 Allen key.
On some later model Fords the calipers have 7mm Allen heads, -an unusual size.
Almost all Kia calipers are held with 14 or 17mm bolts, NOT Allen screws.
If your asking about what size wrench is needed to remove the bolt that holds the front brake calipers on a 93 Chevy pick up, it would be a 3/8" allen wrench.