I hope this conversion chart will help when that elusive wrench or metric socket just isn't available.
10mm = 3/8"
11mm = 7/6"
13mm = 1/2"
14mm = 9/16"
16mm = 5/8"
17mm = 11/16"
19mm = 3/4"


These are all real close equivalents. They might need a slight tap or wiggle just a little but it beats rolling up sanding cloth in a larger socket and beating it on the offending bolt.

Buck1234