Tuut Door Lever Lock was designed specially for parents like you, we noticed a lot of complaints about other brands, where parents have been locked out by their children. Parents have been traumatized and had nightmares, therefor Tuut has designed a product where there is no flaw, we made this design specifically for you. This door handle lock was designed to fit most handles with a really simple installation, your doors can be childproof in seconds just peel & stick, It has strong 3M adhesive this way no child can remove it. When your child grows up and you no longer need these on your doors just remove the lock, it’s easy for an adult to use but hard for a child. if there is any leftover adhesive just use alcohol or any product that removes adhesive.