The thule set of 4 barrel locks gives you the advantage of having one key for all the brilliant thule one key system is perfect for when you have 2 or more thule products with locks having just one key to fit all means you have no hassle of having several different keys giving you one key for all with the set you also get a grip friendly thule comfort key the thule set of 4 barrel locks are also available in larger sets the thule set of 4 barrel locks features all locks use the same key