Give your cat the freedom to come and come as it pleases with this cat flap with a locking system with 4 directions. Slide the locks on the bottom of the pane. To set the door to one of the following options: The cat can only enter the outside but do not come out the cat can go out but can not go home (to prevent other cats from entering too) the flap is locked on both sides the flap is completely open and the cat can Go and come at will The cat flake is easy to install and suitable for any wall or door with a maximum thickness of 50 mm. is also suitable for the Small dogs / cats. Features: Size: s: 19 * 19.7 * 2cm M: 19 * 19.7 * 5.3cm l: 25 * 23.5 * 5.3cm XL: 25 * 5.5 * 27.7cm (Please measure your pet before ordering!) The 4-way cat flap is new and packed Material: Hard plastic Installation method: Tools needed: electric drill , iron saw or electric saw, measuring rule; Step 1: first use a piece of paper to draw the size of the door cover (there may be a mistake R of a few