OTC 7544 24mm Strut Rod Nut Socket This specially designed socket is needed to loosen and tighten the top strut nut when servicing the strut spring or strut cartridge The socket is used with a 1/ 2 inch ratchet or breaker bar to turn the strut nut while holding the strut rod with the appropriate wrench The socket fits 24 mm strut rod nuts found on many domestic FWD vehicle