Provides a more responsive feel, produce less deflection, have more precise attachment to the rocker, and not bend or deform under the higher seat pressures being used on many engines today. In addition, because of the higher caliber material, the hook has better capabilities of being "massaged" with a belt grinder if you have clearance issues between the back of the rocker arm and the head rail. Perfect for Sonny's Chevy Hemi Intake and Kaase Ford Hemi Intake