quick thread question

7/16 14 bolts have a 5/8 head.

Well, no, in Canada they have 16mm heads. A size never before seen in my toolbox until Canada forced me to buy one. You know, when we got bombed by the Metric System. But as you know. 1 of 16mm in your toolbox is never enough so I ended up with 4 new 3/8 drive sockets, 2 new 1/2 drive sockets, and a handful of wrenches. Boy was I a DA, 16mm is .6299inch, verses .6250 in standard. So all those 16s are languishing in the spares drawer, along with the 19mms and the 13s, and the 8s.