COMP Cams Valve Locks 617-4 Ideal for use in race applications, our wider 10 degree angle locks better distribute increasing spring loads over the retainer more than typicaly 7 degree locks. Set of 16 - 10 Degree, .310", Single Groove Locks w/o Lash Cap Recess 617-4 - SUper Valve Locks, 5/16" w/o Recess COMP Cams Super Valve Locks 5/16in W/O R