Tapered 7/16" 4130 chromoly heat treated one-piece non-adjustable pushrod set. With a .095" wall thickness and precision concentricity. Increased stiffness and rigidity for maximum valve lift under high RPM loads. Quick-install type pushrods may be easier to install, but they cannot compare to a one-piece fixed length pushrod for strength and durability. Black oxide finished with swaged formed ends. Designed to work with the factory base circle camshaft dimensions. Will work with all Feuling, OEM, SE and other camshafts with stock base circles.