The Munchkin Safety Toddler Bed Rail keeps your little one safe and sound while in bed. The lightweight extendable metal frame, measuring 18" inches tall and extending 36" inches wide, is padded, covered with fabric, and fits mattress sizes twin to queen. The secure locking mechanism and convenient hinged folding design makes lifting your child and changing their bedding easy. And to make your life even easier, there is no assembly required.