Looks like a good set of drill bits but there were a few loose bits in the box and the 3/16 bit was missing. I tried requesting a 3/16 spare bit but their system wanted to return the entire set for just one bit.
For some weird reason I got a wrong sized set closer to the bottom of the bit sizes. I have another Irwin Turbo Max Kit that has the correct dimensions. You can expect better packaging for the high-end Kobalt kit (which costs $40 more than Irwin's regular HSS). I will update the review after drilling stainless steel with this set.
Good quality drill bit but the case is large and chunky compared to the old Craftsman metal case that came with my last set of drills. I've tried fitting new parts into the old case but they are too big to fit which I don't understand. I haven't used them to pre-drill a threaded hole yet. If they are too far out of tolerance I will revise the rating. Revision: After about a year of use I would say that they are not of very good quality. I have broken 3 bits so far with very limited use. Theyβ¦