They are perfect for 1 or 2 jobs around your new apartment/house. I needed my first set of drill bits to install the curtain rods, towel rails and wall shelves. I used them with a Black&Decker 20V MAX drill. First I attached my towel rail and then attached 3 curtain rods. On the 1st cornice the drill was already blunt and I had to use a replacement which eventually became blunt on my wall as well. Bits are basically useless for any future project. So you get what you pay for, basically a one-time use.