I have a full Brownells set that was presented to me by Bob Brownell when I visited in the mid '80's. I have broken a few bits as they are quite brittle when ground to suit the narrow slots on English shotguns, but I have never had the gall to ask for replacements on a gift! Any good quality drivers from respectable makers are fine. Take care when hollow grinding to not overheat the tip (changing colour) and quench frequently.
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