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When you get over about 18mm, most metrics have a decent fit in 6 point sockets. 19 mm is 0.74803", give or take. Less than a sheet of paper difference.
I too discovered this. Also, a 22 mm fits on the 1008/1010/1028/1031 singles. I thought it was 7/8" but 22mm is a better fit.
Thankfully I have a full set of metric impact sockets.