Specifically designed for use with most convertible cribs, the Convertible Crib Mesh Bed Rail by Kidco is designed to help safely transition your children from a crib to a "big kid" bed. Using steel and mesh materials to ensure durability, this bed rail can be safely used between the heights of 13 - 14" (33 x 35.6 cm). The easy installation, requiring no tools, makes this bed rail a must have for all parents.