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^^^lol thats what i do. I have a bunch of cheap sockets for that. I just weld throught the center of the socket. Also, I tried to remove a brake part on my car with one of those extracers and it just made it much worse.
The best way is to use an imapct driver with those in it. Same with the craftsman easy outs. When you use those in a drill it's an awful result most of the time.
Also, the terminology on their ad is wrong...they say stripped screw...they mean rounded out.
I also have a snap on version of those, they work well. Once in a while they arent enough by themselves, but heat the area with a torch and use the bit and i have never had one not come out.