Only 2 sets of straps to attach unlike 3 sets on the cheaper models. Once fitted you can lock the car retention straps in position so it can't be removed from the vehicle and also has a plastic coated metal braided reinforced cable that can run through the last bike and lock to the rack so bikes can't easily be removed. Both keys in my possession. Convenient for no extra charges at ferry ports where increased height (roof carriers) are charged extra as tall vehicles like caravans. This item is in the category "Sporting Goods\Cycling\Car Racks".The seller is "andyrno1" and is located in this country: GB. This item can be shipped to United Kingdom.