Works great under the right circumstances
If you have enough access and there's enough of the bolt head left these work great. The only time they come up short is if you can't get to it with the extractor, a hammer, and a wrench or socket. It helps a lot to hammer the extractor on it first. The steel quality is great, even after working with grade 8 fasteners the fluting inside is good, and the case is great too, nothing comes out of place when moving around.
BobJ
USA