🔧 Irwin Tools 3016021 Single High Speed: Precision, Durability, and Reliability Combined Review

I bought this to make 4 screw holes in mild steel - 20 gauge sheet metal, double, about 2mm total depth. I used cutting oil and a Makita 3/8 hand drill (love this drill - 25+ years of use). The first hole went well enough, but then it all went downhill. Hole 4 was a miserable cycle of push and catch, push and catch. In addition, the reduced-diameter shank is smooth and without grooves, which makes it easier to work with the jaws of the chuck. It would be hopeless for stainless steel drilling…

I bought four of these as I tend to drill a lot of a certain diameter holes. The first thing I used was drilling through nice soft 6061 aluminum. The piece was about 3/16" thick. The drill bit broke before it even got into the metal! And yes, I used lube and not too fast or drilled too deep.The second practice ended with no issues and ran about 40 more without incident.So it looks like they hit or miss.Quality control issue?I don't know until it finally wears out/brokes and I have to get the…

I've only used one of these drill bits for a couple of jobs but I can tell they are straight away of excellent quality. For those considering the value for money of a cobalt drill versus a cheaper titanium drill, let me share some more information. I used to work as a heavy structural mechanic for a major US airline. This work required the removal of many of the titanium fasteners. Guess which bit we used to take the fasteners off? So; Cobalt. A regular steel drill will not even mark a titanium