Kind of mediocre design 6mm through 12mm are not breached very deep wasted about 4mm of space could have made them that much shorter instead they made them all the same hight. The 15, 16, and 17 they could have drilled about 1/2 way up on 3/8 broach enough for bolts sticking out of nuts to clear. Some of the old craftsman sockets were designed that way. Nothing special about this brands design would not reccomend over other brand just buy what is cheapest.
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It came very quickly ..too soon to see if it’s working, but I’m hopeful!