After dealing with stud removal and extraction for many years, I have owned and have tried most all of them at one time or another!
One of my favorite is this type (Gearwrench and and few others make them) that has a some long roller bearings inside the barrel and will grab the stud very good for extraction.
This one also will release the stud if you decide you want take the stud removal tool back off the stud for any reason simply by turning it a little bit in the opposite direction...
A big hint! When working with aluminum parts that have steel studs, spray it good with some CRC Freeze-Off Super Penetrant and then rap the end of the stud several times with a heavy hammer to help jar it some and hopefully loosen it. Repeat this process several times as needed on the more stubborn ones....
If the stud will not budge, continuing to twist on it with any stud removal tool
will twist or break it off, when this happens, it's time to drill out and retap!
This one also works good if you have enough room especially on the larger size studs; just be sure you purchase a good quality one and not a cheap version!
There are a multitude of other types of extractor tools available; I got a toolbox full of them, but these two are good basic stud extractor tools and they seem to work best!
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