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Made in the USA, Stage 8's Grade 8 locking header bolts use a patented system that consists of a grooved hex-head bolt, a retainer, and a snap clip. The retainer fits over the bolt head and locks the bolt against the header tube, and the snap clip holds the retainer in place. Once Stage 8 header bolts are tightened down, they won't back out, eliminating leakage and blown header gaskets from loose bolts.
these went on super nice and were easy to put the clips on to lock them. I also discovered the clips can be turned over to get just the right fit if you need to. I like having the extra protection of a physical lock to keep those pesky exhaust leaks at bay....