This was the perfect "companion purchase" to the McGard 74018 Marine Single Stern Drive Lock Set.  This was purchased to deter thieves from stealing the propeller while the boat is in transit cross-country and even while sitting vulnerable in a storage yard or side yard of a residence.  Thieves like to take things easily that don't belong to them so they can take them to recycling yards for quick cash.  Why let yourself become a victim!