Dewalt DW2535 3 Piece Countersink #6 #8 #10 for $13.28

Lowest price ever says the website that rhymes with mammal, mammal mammal.
I’ve always countersunk the old fashion way, using two bits. I always run into this set, but they’re always $20 something bucks. For $13.28.. why not?
Dewalt DW2535 Set