Or just use as is with a 12 face socket.
It would be interesting to do the CAD and see how many sizes it would need to be able to hold taps upto 3/8 or 10mm, I’m sure mine would have more than 3 different diameters. His all look to be one make of tap.
I also wonder why people make a point of mentioning using roughing mills on such shallow cuts, they are intended to break the chips when using a large amount of the side flute not the first 1mm or so, may as well have just gone straight in with his fly cutter.
As for the “only tap wrench you will ever need”, it only goes upto 3/8″ and even then he has to use a second larrger tap wrench to turn the larger sizes? I almost gave up 2mins in as he said he needed it to guide taps without a ctr hole. Why not just a female crt on the tap guide, many come with a reversible end just for that reason.