Just a little heads up maybe, either they really suck now or all I bought were from a bad run. At work most of my drilling is in Stainless. I dont mind using the Dewalt and other cobalt bits from Lowes or Home Depot in my coldless drill around work since you may drill a plate and hit a piece of tile or anything, they usually dont stay sharp all that long. I got some of the new Dewalt bits a few weeks ago because I was getting low on some sizes and I liked the idea of the flatted shank for the keyless chucks. I had to drill a 3/16 hole in a 11 guage Stainless plate and a piece of 24 guage stainless to pop rivet them together. Pilot drilled all the holes 1/16" since they werent in all that easy of a place to get to. Stepped up to 3/16" drilled 1 old bit was dull so in one of the new Dewalts go. 3/4 of the way through the bit twisted off about 3/4" up from the point like a cheap grade 1 bolt. The lands and valleys were missing now. I was totally in awe, OK. Open another pack drill 2 holes fine, great chips, bits cut good anyway, then the bit stopped for a moment on breakthrough chuck didnt though. Pulled the bit out and the shank where it was clamped in the chuck has twisted the flats almost a half round. It also had bent the bit like a bananna. Bent it back most of the way straight and finished the other 3 holes. I have never twisted or bent a small drill bit like that without breaking it let alone twisted it up like a screw. I threw the first one away but kept the second just to show the guys at the shop. It made for a good laugh anyway. I think they may have forgot to harden them or something, bad thing is I have 10 more