These Steel Super Locks™ featuring a lash cap recess, 10° lock angle and 11/32" valve stem size are recommended for all race applications. Super Locks™ have a wider angle (10°) that better distributes the ever increasing valve spring loads over the retainer than typical 7° locks. Precision-machined out of super-tough, fatigue-resistant metal alloy, Super Locks™ fit any COMP Cams® 10° retainer.