It's a lifesaver when you break a screw in an important place. For me it was the cylinder head of a Caterpillar 3126b diesel engine, trying to change the exhaust manifold gaskets 7 of 12 screws ripped off. I stupidly tried Easyouts, clicked on one of them and then found this one. I drilled through the centers of the studs, starting with a small pilot drill and then using more and more until the hole was just the right size. It was more difficult for the one who broke the easy exit! Countersunk with the tool provided, tapped, inserted the ring and flared with another tool. It's VERY easy to figure out how to do, and VERY VERY fun to do successfully. I've driven 3000 miles since then and the bolts I attached them with hold a 40lb turbo and a large trunk header. There are no leaks yet and I don't expect any for a long time. Don't let the price put you off, it's worth every penny if you're in a situation like mine.
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