Review on 🔧 Irwin Tools 3016021 Single High Speed: Precision, Durability, and Reliability Combined by Andrew Agarwal

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 mount, and a cobalt drill will pierce them as if they were mild steel. Another advantage of cobalt drill bits is that they stay sharp longer. The downside is that once they need sharpening, you will find it very difficult to sharpen them with a regular whetstone.