Originally Posted by survivor

I am trying to figure out what the metric size of a few standard wrenches i own.

5/8=15.875 mm
11/16=17.462 mm
13/16=20.637 mm

A 1/2 = 12.7 mm an inch i see is a bit smaller than a 13mm, i know i should only use the right tool but these are brand new snap on wrenches i would like to use maybe on a travel bag.