Outboard Lock - 1/2in.-20 Thread Size - Stainless

Designed 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. Fits: Mercury/Mariner 40 HP and larger (2 stroke) Optimax 75 HP and larger Mercury 25 HP and larger (4 stroke) Verado 135 HP and larger Suzuki 150 - 300 HP