Features revolutionary design - allows quicker, easier installation without the removal of the rocker coversThreaded adjuster screws into the pushrod until the threads disengage and the adjuster simply slides into the pushrod, making installation or removal a snapOnce the pushrod is installed and adjusted, the lock nut prevents the adjuster from movingBall ends of pushrods are drilled so oil can flow through pushrodsMade in the USAWill require aftermarket pushrod tubes that allow access to adjusters (unless otherwise noted).