I have used this set several times when I have accidentally rounded off a bolt or a nut and it has been very successful when I can get it on the nut or bolt. Sometimes I have to grind down the bolt to fit the socket on but when i do it comes right off.
Bolt out tools work on striped head bolt very good. striped head bolt like oil drain bolt on oil pan, lug nuts on wheels, etc.
The Bolt out set is a real life saver on rounded/rusted bolts. Every tool box should have one.
-Sly
Bought bolt out to get a rounded nut off, I got it off.