Twin Yamaha Stern Drive Lock 

McGard Stern Drive Locks - Twin Drive Lock

• Overall Lock Length: .750"
• Thread Size: M12 x 1.25
• Hex Size: 5/8"
• Set of 2 Locks, 1 Key and 2 Caps

Stern drive theft is on the rise, don't take a chance on losing your favorite outdrive or prop, for that matter be safe not sorry. Simply replace one of the stern drive mounting nuts with a McGard lock. Stern drive locks are fully machined from high quality stainless steel and through-hardened. This proven design features a free-spinning collar that turns if attacked by gripping tools without loosening the lock. Give yourself the best protection available against stern drive theft. Ask for McGard Marine Locks by name.