Hi-Lift Versatile Lock Safe lock, protection for Hi-Lift Jack;Works with several Hi-Lift mounts;1/2 bolt;Replaces an existing knob or wing nut;Once locked, the locking knob spins freely and cannot be remove Hi-Lift Jack Hi-Lift Jack Hi-Lift Versatile Lock - VERS-LK VERS-LK 4X4 Jack Mount Kit