1. The applicable door frame width of this horizontal bar is 29.5-37 inches. It is not recommended to use this product for door frames outside this range. 2. The horizontal bar is suitable for solid surfaces such as tempered doors, solid wooden doors, and walls. It cannot be installed on surfaces with poor load-bearing such as glass doors. 3. The maximum load-bearing capacity of the horizontal bar is 440lbs. If the weight is greater than this load-bearing capacity, it is not recommended to use this product.