WIDER DOG GATE FOR STAIRS: The NCDCNI upgraded dog gate indoor can be freely combined, adding 2 extended fences on the main door. Equipped with a total of 4 extension screws, one single screw can be extended to a maximum of 3.9 in, which is more detailed than the adjustable range of ordinary dog gates. Width ranges is from 29.9 - 43.7 in and height is 31.5 in. Don't worry about the mess in your home, you need NCDCNI gates to keep dog out of litter box!ANTI-TRIP RAMP & SMALL PUPPY GATE: The anti-trip ramp design reinforces the cat gate support while preventing kicks or trips. The opening pet gates for dogs width is 23.6in, and pet strollers, and injured or elderly pets can also pass through easily, ensuring the safety of your family and pets. This dog gate with cat door is also equipped with an 8.5*11.4in cat door, so small pets can pass through freely.DUAL SECURITY PROTECTION: This doggy gate uses a dual-linkage safety lock system to prevent pets or family from opening the door easily. Dog gates for doorways can be opened both inside and outside. It is scientifically designed to remain open when the angle is greater than 90° and automatically rebound to close when the angle is less than 90°, no need to worry about forgetting to close.SAFE AND SOLID MATERIAL: Our walk through doggy gates are made of thickened steel that can withstand up to 210 lb of impact - the door tube walls are up to 1.0mm thick and have a higher carbon content than regular doors. This pet gate with cat door is formaldehyde-free and 100% passes the anti-rust test and the safety test. Suitable for use in different scenes such as doorways, stairs, indoors, and outdoors.2 INSTALLATION METHODS: Pressure mounting and screw mounting can be selected for this dog door The 2 types of mounting are fixed with reaction force. Equipped with reinforced pads to increase friction with the wall and prevent damage to the wall. Y-shaped spindle rod comes with better adaption to wall corners and round rods. Package included: 1*main gate, 2*7.9in extension, 4*extension screws for regulating expansion, 4*reinforced pads, 1*Y-shaped spindle rod, and other install tools and accesso1-YEAR WARRANTY: Every NCDCNI retractable dog gate is professionally inspected before it leaves the factory to ensure that the performance meets our requirements before it is shipped to you! We offer a 1-year warranty, if you have any questions about using NCDCNI pet gate, please contact us in time and we will replace it for you as soon as possible. NOTE: Please measure the size before purchasing. The contact surface of the side door frame must be greater than 1.2 in. The mounting height needs to be greater than 32 in, and the mounting width is 29.9-48 in.