The lockable 4-way cat flap for installation in glass doors, windows, or wooden doors allows your cat to decide for itself between indoors and outdoors, without you losing control over it. The delivery includes a self-closing mechanism that fits glass panes up to a thickness of 3 cm. However, if you have existing or double glazing, a new glass pane will be required. The transparent safety glass is sturdy and lockable. Nevertheless, the weatherproof and quiet flap is easy to operate. The round cutout in the glass has an average diameter of only 22.3 cm. This eliminates the hassle of opening and closing the balcony door or window, while ensuring your cat is always safe and secure.