4-way locking system: entry, exit, entry and exit, complete locking, easy control of your cat. keeps stray animals away. Simple installation, suitable for wood, PVC, UPVC, walls and glass doors. Waterproof see-through flap with mute closure. Durable plastic frame with four-way manual lock. Excellent Quality: Full Refund Guaranteed.Please note this item is suitable for cats and dogs under 7kg. Total Size: Width: 20.3cm, Height: 24.5cm, Depth: 3cm. Please refer to the image for size reference.