The 7/16" tapered design is made from chromoly steel and is much stiffer than OEM pushrods; provides maximum lift and dynamic stability when running performance camshafts Fully adjustable, so they can be installed without the need to remove rocker boxes, makes cam installation easy Laser-etched alignment marks make it easy to keep track of adjustments Black oxide finish Made in the U.S.A.. PUSROD TAPERED KT99-17TC