This safety gate comes with a 9 cm extension and can be used for opening widths of 84 - 89 cm. You have a larger opening width? Then we recommend the Stop N Safe 2 stair gate that comes with a 21cm extension (96 - 101 cm). For standard doors, we recommend the Stop N Safe 2 without extensions (75 - 80 cm). All models can be combined with a second extension and Y-Spindels (for round stair railings). The metal safety gate is installed with four fixing screws by pressure and leaves no trace when removed. , , Adults can open the 50 cm wide safety door with one hand only in both directions. This way, one hand remains free for the little explorer. The door's two-fold manual locking mechanism can't be opened by small children. With an additional 9 cm or 21 cm extension (sold separately), the Stop N Safe 2 gate can be extended up to 110 cm. If the gate is to be installed on round stair railings, we recommend the hauck Y-Spindles as accessories. These replace the fixing screws on the safety gate's side that needs to be fixed on round railings. , , The following opening widths are possible: 75 - 80 cm = safety gate (without extensions)84 - 89 cm = safety gate + 9 cm extension (included)93 - 98 cm = safety gate + 9 cm extension (included) + 9 cm extension (optional)105 - 110 cm = safety gate + 9 cm extension (included) + 21 cm extension (optional) Note: This item is a self-adjusting gate. This means that the initial inclination of the side part is eliminated by tightening the locking screws in the frame. This way, a secure hold and a parallel fixation of the side parts is possibile.