"The last time I used an auger bit for drilling through joists was around 40 years ago, but then you used a hand brace as power drills hadn't been invented ! I needed to get a bit for drilling many holes for a decking project and thought I would try one of these as an altenative to the set of flat wood bits I had been using for many years. This auger bit is brilliant not only do I now get cleaner and straight holes through joists, but the screw thread makes the work effort negligable which is important when time marches on. I will be getting more of these bits of various sizes as and when I order other materials from Screwfix. They are a good quality product for a very fair price in my opinion, this review is based on DIY amateur work, I am NOT a professional so my tools don't get worked too hard, that needs to be understood naturally."