This safety gate closes and locks by itself! Just what you need for peace of mind. It features convenient walk-through styling, easy one-hand use, an auto-close, auto-locking mechanism and quick installation. Includes mounting cups that attach to surfaces for extra security. Measures 30″ high and fits openings 29 1 2″ to 38″. Using a combination of extensions, available in 3″, 5 3 4″ and 14″ the gate will fit openings up to 61″. Heavy-duty metal construction. Not recommended for installation at top of stairs.