Single O/B Lock 5/16-18 F/Sm 

"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. (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: 5/16-18 Honda 8-30 hp, Johnson/Evinrude 6-30 hp, Merc/Mariner 8-25 hp, Nissan 8-18 hp, Suzuki 8-30 hp, Tohatsu 8-18 hp, Yamaha 8-25 hp. May fit other 2-strokes up to 30 hp with 5/16-18 bolts., Finish: Stainless

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