SAFE AND DURABLE: The indoor cat flap is made of ABS material, which is wear-resistant and durable. The edges are smooth and burr-free to protect cats from scratches. Clean line design, paintable materials, perfectly matched to the door and panel. Scope of application: Indoor cat flap, suitable for all hollow and solid doors as well as interior doors, perfect for laundry rooms, bedrooms, basements, etc. You have your own space to make your home smell fresh. Barrier-free door design: No one is home. Store cat food indoors. The interior door is equipped with a cat flap, so you don't have to worry about dogs getting in. Cats can freely enter and exit to play, eat, and drink! No Falling: The indoor cat flap is secured with screws, preventing falling and tearing caused by the adhesive tape. There is no noise, no problems with door locks, and no damage to doors. External dimensions: 26.6 x 23.9 x 5.5 cm, through hole: 17.5 x 3.5 cm, suitable for doors with a thickness of 2 cm to 4.5 cm.