mcgard-outboard-lock-40hp-merc-amp-upDesigned to lock the outboard onto the transom, simply replace one of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft and inconvenience. (74049 fits most of the motors listed and will fit other small outboards with a 5 16" hole in the transom bracket for mounting the motor.) Description : 1 2 20 Merc Mariner 40+ hp (2 stroke), Merc 25+ hp (4 stroke), Suzuki 150 300 hp