This thing works. I center punched the bolts that sheared off and started to drill. As I was still drilling both bolts they backed out. Definitely worth the buy. Sharp and seem to be well built. Good buy.
My desk has moved a couple times and the screws were getting stripped. These bits quickly to the screw out no problem. It worked great! You need drill the new hole pretty big, so make sure the size of the bit is almost as big as the screw head. It surpassed my expectations!
Worked as advertised. Had a stripped head on a 2 inch wood screw stuck in a stud (picture of how bad the screw was is included with this review). Slowly increased/cranked up settings on the drill one at a time and the screw came right out. Money well spent!