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I generally bought Craftsman when I bought tools. They are almost as good as SK or Snapon, and so far as my usage goes, they are good enough. Invariably you could not get the 16mm or 18mm sockets or wrenches in any tool set you bought from Craftsman unless it was the super deluxe set.

Must have changed, as I do see a Craftsman 3/8" Drive 11 Piece 12 Pt Metric Deep Socket ( 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm) on Ebay for 20.79 (23.00 at Amazon

I wonder what ratchet drive sizes they use in Europe?

wikipedia informs that the ratcheting socket wrench, with interchangeable (indexable) sockets, was invented by an American, J.J. Richardson, of Woodstock, Vermont, USA. The tool was patented (Pat. No. 38,914) through the Scientific American Patent Agency on June 16, 1863 Standard sizes of square drives around the world include 1/4", 3/8", 1/2", 3/4", 1", 1-1/2", 2-1/2" and 3-1/2" square drive sizes (a de facto international standard with no metric equivalents[citation needed]) along with some lesser used drivers such as 5/8" square drive, and both #4 and #5 spline drives specified in ANSI B107 specifications.

drive fittings come in four common sizes: 1/4 inch, 3/8 inch, 1/2 inch, and 3/4 inch (referred to as "drives", as in "3/8 drive"). Despite being denominated in inches, these are trade names (common product name), and manufacturers construct them to 6.3 mm, 9.5 mm, 12.5 mm and 19 mm, having been rounded to a reasonable, if haphazard, metric value. Larger drive sizes such as 1 inch and above are usually only encountered on fasteners of larger industrial equipment, such as tractor-trailers (articulated lorries), large cargo aircraft and passenger airliners, and marine work (merchant fleets, navies, shipyards). The sockets themselves come in a full range of inch and metric sizes. ("SAE" is often used as a blanket term for the nonmetric sizes, despite the technical inaccuracy of that usage.) https://en.wikipedia.org/wiki/Socket_wrench

For bikes I prefer the breaker bar

That has never worked for me. They often just round off the bolt or nut i'm trying to remove. Oddly enough, even though 16 and 18 mm are usually absent in various tool sets i've bought over the years, they are invariably used in many vehicles I have worked on.

Well, at least you know how to work with your God-given hands (not surer if they are imperial or metric)!

Must have changed, as I do see a Craftsman 3/8" Drive 11 Piece 12 Pt Metric Deep Socket ( 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm) on Ebay for 20.79 (23.00 at Amazon

I have an accumulation of tools I have bought over the last two decades, and I haven't bought any new mechanics tools in the last 10 years.

I've bought from Sears and I've bought from various other brick and mortar stores, but I always had to go back and buy those two sizes separately. Perhaps someone decided to do something about it.

I don't buy from Amazon, (Amazon corporate supports too many things i'm against) but I do buy from Ebay.

(a de facto international standard with no metric equivalents[citation needed])

So that's rather amusing that the Europeans with their Metric system still use the Imperial standard based drives on their sockets. That's a real hoot!

Well, at least you know how to work with your God-given hands (not surer if they are imperial or metric)!

More so than I like lately. Everyone and their dog wants me to fix their Car, Truck, or whatever.