Allows a 60cm passage planned for installation in a passage of 75 to 82cm. It is possible to add extensions sold separately for a distance 82 and 132 cm (attention to final cost). In contrast to the passages of less than 75cm is just impossible! Just know, it's written on the box once the product is received ...;) Product well finished and mounted almost everything! Resistance and validated standards for children up to 2 years. Locking and unlocking the door with one hand (that's useful!) And passing in the 2 possible sense! (It's more convenient than having to go back). One can also not allow the passage in one direction through bolts at the bottom of the door are lowered on one side or the other (useful steps to protect for example). As against the U-shaped structure inevitably leaves a bar (with a height of 3 cm at ground level) in the part depending on configurations can be embarrassing. The pressure exerted on the walls is very strong (firm ground) which can cause problems on fragile walls or a stair railing a little tired, so it's of things to consider before installation or purchase .. . Here I think I have given all the facts before you purchase this item if some want to know more you can always ask a question and I'll try to answer them ...