1.FlexibilityOuter door cat flap with 4-way twist lock to control your cats access options: entry only, exit only, free entry and exit, full lock. 2.Applicable toThe outer frame size of the flea door is 22 x 20 x 3cm, the door size is 15 x 15cm, suitable for doors and windows with a thickness of from 2 to 6 cm and animals weighing less than 7 kg. 3.MagneticA waterproof brush strip and a magnetic strip are attached to the pp dog door. Effectively reduce noise, prevent wind, rain or mosquitoes from entering 4.Easy InstallationFollow the installation instructions to install the 4-position cat flaps in wall, wood, glass, PVC and metal doors and windows. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin