On 2010-11-06, willshak wrote:

SAE. One of my 14mm open end wrenches from one company is 14.5mm, and
one from another company is 14.25mm. If you have a pair of inside
calipers, and more than one brand of wrenches, check it yourself.

Sounds like a quality issue. It's been my experience, Japan makes a
lotta great stuff. Mechanics tools are not among them. Use a
Japanese 14.25mm open-end wrench a few times and it WILL become 14.5!

nb