Product Description The Regalo Top of Stair Gate offers a universal installation kit that fits 99% of stairway applications. Simple Glide Technology allows gate to expand and fit stairways 28" up to 42" and easily expand inward and outward while passing through. Easy to install. Adapter kit is included and does not require any drilling into or marking up your banister or woodwork. Brand Story By From the Manufacturer The Regalo Top of Stair Gate offers a universal installation kit that fits 99% of stairway applications. Simple Glide Technology allows gate to expand and fit stairways 29" up to 42" and easily expand inward and outward while passing through. Easy to install. Adapter kit is included and does not require any drilling into or marking up your banister or woodwork. Note: Depending on the shape, dimensions and mounting components utilized in your doorway or opening, the maximum and minimum length of this gate may increase and/or decrease slightly. When mounting between: Two walls without any baseboards: The opening width must be between 28" and 42". Two walls with one baseboard: the opening width must be between 29" and 43" Two walls with baseboards: The opening width must be between 30" and 43.5" One banister post and one wall without a baseboard: The opening width must be between 28" and 42" wide. One banister post and one wall with a baseboard: the opening width must be between 29" and 42.5". Two banister posts: the opening width must be between 28.5" and 42".