It didn't tell anything that isn't already known.
Variety - includes flat, pin, standard and slotted square, 12mm square, 3/8in square, and hex heads"
There's a lot of difference between 12mm and 3/8".
12mm=.472".
3/8=.375
11mm=.433 which is the same as 7/16"
10m=.393, just over 3/8"...