Buy quality, because it's cheaper than buying cheap multiple times.
It's hard to find information online about some Snap On tools, but these came recommended by a machinist friend as the best type of extractors for broken bolts and studs. I had a nasty one, and other easy-outs just spun and stripped, while the Snap On gripped and fought the stud but won in the end. These are expensive, but so is removing a cylinder head and taking it to a machine shop. And a real pain. Recommended.
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