These Ls1/Ls6 Bead Lock Steel Super Locks Feature A 10 Degree Lock Angle And 8Mm Valve Stem Size. They Are Recommended For All Race Applications Because Super Locks Have A Wider Angle (10 Degree) That Better Distributes The Ever Increasing Valve Spring Loads Over The Retainer Than Typical 7 Degree Locks. Precision-Machined Out Of Super-Tough, Fatigue-Resistant Metal Alloy, Super Locks Fit Any Comp Cams 10 Degree Retainer.