Billy writes: “I’ve had RIDGID’s 10-piece set for years, and it’s helped me get out more broken off bolt nighmares then I can count. EZ-outs and other conventional bolt removers have twisted flutes. When you turn them into the bolt, they expand the bolt and actually make it even harder to remove. These straight-splined extractors from RIDGID cure that. They also come with a lifetime warranty. Believe me: It’s the best money you can spend for a fastener extraction kit. No serious shop can be without this.”
We’ve used EZ-outs and such in the shop for a while, but these appear to be worth a look. I’d be interested to do some side-by-side testing to see Billy’s ideas in action.
They also sell as 25-piece set, though it doesn’t seem to make it to as many shelves; maybe the 10-piece is plenty. The 10-piece (pictured) starts at around $75 street.