Crane Cams 1.425 inch OD Valve Spring Retainer, (Set of 16) features rugged steel valve spring retainers. They are made from high-quality steel bar stock. They are heat-treated for maximum strength and durability, and black oxide coated for corrosion resistance. The titanium retainers are also offered, precision machined from certified grade bar stock. They feature either a 7 degree or 10 degree taper, and they are compatible with either Crane's stamped valve stem locks or their machined steel locks.