These work better than 80 of extractors out there. And for the price point, you will not find better quality, without spending twice as much. The key to extracting screws/bolts is making sure it's center punched as close to center as humanly possible. Even more important on those small screws. If you don't take your time on this step, you won't succed. Just as important is making sure the drill is held as close to perpendicular as humanly possible. If you are trying to use the extractor turning the bolt at a 15 angle from the threads, you will shear the extractor every time. Every pic I see with a sheared extractor, has it going in at an angle. Last tip is to use heat and penetrating oil. If a bolt doesn't budge and you just twist the heck out of it, it will snap. The tradeoff of having "harder" steal is that it doesn't have the best properties to avoid shearing. Gave it 4 stars because the drill bits are Chinese and useless. Extractors are American and well made.
Rating:
[5 of 5 Stars!]