DEWALT DW2551 6 Piece Hex Bit Set

Two of these bits broke on the 1st or 2nd use. I was drilling kitchen cabinets for a screw hole so it was not heavy duty use. The "break" did not occur on the drill bit itself, but where the drill bit fits into the hex shaft. The bits are actually two pieces, a regular drill bit which is pressed/inserted into a hex shaft. Since it was exposed, I was able to see that the drill bit shaft had a flattened area that apparently is supposed to be held by another flat area inside the hex shaft. I was able to reinsert the drill bit back into the hex shaft and turn it freely by hand. Whatever was supposed to "catch" and keep the bit from spinning was obviously long gone. Hopefully I just had a bad batch. Amazon is replacing them and I'll see how they do. Knowing what I know now, I'd probably opt for a one piece hex drill bit, rather than what turned out to be a two piece setup.