These Steel Super Locks™ with +.050 install height feature a 10° lock angle and 3/8" valve stem size. They are recommended for all race applications because 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.