[DiogenesLamp]

The US auto industry largely went metric some years ago. Of course they like 16 and 18mm hex heads ilo the 15/17/19 mm heads that the Germans used since way long ago.

And for some reason, nobody seems to include 16 and 18mm anything in a basic metric tool set. Unless you buy a deluxe set or something, you end up having to purchase the 16 and 18mm sizes separately.

D@mned annoying.

[Paladin2]

Yep, 3 sets of tools. As if my arms weren’t long already...

[daniel1212]

Well, at least as re socket sets, I was able to get this set (10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm) for 11.49 at Walmart a few months ago for 11.46, thanks be to God, but now are out of stock.

They are not SK ot similar, but do the job for the larger bike axle nuts. However, notice that the metric sockets are SAE 3/8-Inch Drive.

I also see a 1/2 drive metric 1/2 Drive Metric Socket Set (not deep though), : 12 Point, 10, 12, 13, 15, 17, 18, 19 & 22MM for $19.00. They are a dollar more at Amazon.

But you should be able to us e a 5/8 socket for 16mm, while 19mm is about 3/4 .

Hope this helps.