Amana and CMT are my favorites. I'll use Freud in a pinch, as they are readily available in my locale.
If you do need to return the bit, return the whole set. Sets should be matched, swapping out just the errant bit really is not an option.
Before you return the set, make a discreet mark on each bit that you will recognize if they try to send you the same set back to you.
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