Wider angle (10°) locks better distribute increasing valve spring loads over the retainer than typical 7° locks reducing the chance of "pull-through" failure. Precision-machined rather than stamped for accuracy. Super-tough, fatigue resistant alloy material. Inside tang-to-taper relationship held tightly for repeatable valve spring installed heights. Available in ± .050" installed height versions. Fits any COMP Cams® 10° retainer, just choose the correct lock for your valve size and application. Super Locks™ are recommended in all race applications.