Wera uses the patented Hex-Plus shape on their hex screwdrivers, which have the flat sides of the bit serrated slightly, giving it sharper corners that better cut into the bolt/screw socket . Since switching to Wera Hex-Plus screwdrivers I have not snapped a single set screw and have even removed a few that I thought were hopelessly snapped. I haven't used a screwdriver larger than 3mm because I only work with small maggots, but they hold up great. I only use Wera as Allen bits/screwdrivers.
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