These race application 10° valve locks are designed for high performance engines with high valve spring loads. These locks are precision machined rather than stamped for the ultimate in accuracy and strength and are made from a super tough fatigue proof alloy steel. Fits any Comp Cams 10° retainer. 10° Super Locks available for popular valve stem sizes with or without lash cap recess also available in. +0.050 in. installed height versions.