Independent shaft Rocker Arm Set designed and patented by Hemi legend Ray Barton. If your Hemi is running all-out, you know the need for a full-roller rocker system that maintains valve train geometry throughout the RPM range and the entire range of rocker arm travel. Reduces friction and valve train weight. Provides easy access to valve springs on race day so you can make critical adjustments and changes quickly. Case hardened and tempered shafts, 7/16" diameter adjusters and jam nuts.