Stage 8's Grade 8 Hex 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.