When I tried this Industrial and Scientific drill bit, I was highly disappointed. It seemed to struggle even with the most basic cutting tasks and I had to apply a lot of pressure, which left my hands aching. Although it claimed to be durable, I found it to be flimsy and it broke after just a few uses.
some wood floors in hard to reach places where a nailer won't fit. I pre-drilled the wood floor as insurance against splitting. The Countersink is ideal for the head of an undercut screw It is also recommended to use a snappy cork cutter, it will cut out caps that fit the countersink snugly Whilst it works great.
Pros
1/4" hex shank can be used with power drills and quick change chucks