McGard 74059 outboard lower unit lock bolt is designed specifically for Yamaha lower units and features a stainless steel locking bolt. Simply replace one of the Original Equipment bolts above the propeller with a McGard lock bolt. Once installed our lower unit lock bolt offers 24 hour protection. Constructed of through-hardened stainless steel for maximum security! A free-spinning collar will turn if attacked by gripping tools without loosening the lock to avoid costly theft. For maximum security, use the Yamaha lower unit lock bolt in conjunction with a McGard outboard motor lock.Yamaha Lower Unit Applications Thread Yamaha F115-F350 L & X

* Shaft Engines

*Except F150TXR Fits most Yamaha V4 & V6 2 strokes M10 x 1.25