Comp Cams Rocker Arm Polylocks offer the ultimate in strength and locking force. They are precision ground for minimum runout and tapered for extra strength in the locking area. Special alloys in the polylock ensure quality and durability not found in any other competitive products. High Energy and Magnum Polylocks are best suited for moderate lift and spring pressures. Hi-Tech Polylocks are designed for all race applications.