The best protection available against expensive stern drive theft. Simply replace one of the stern drive mounting nuts with a McGard lock. These stern drive locks are fully machined from high quality stainless steel and are through-hardened. This proven design features a free-spinning collar that turns if attacked by gripping tools without loosening the lock. Fits the following single drives: Mercruiser Alpha, Bravo I-III (Incl. X and XR) Blackhawk OMC Cobra and King Cobra Volvo SX, DP-S.