Here's a great solution to help keep kids feeling safe and secure when you're ready to convert the crib to a toddler size bed. Our convertible crib rail fits most platform or mattress/box spring style convertible cribs. It's made of natural furniture grade hardwood and can also be custom finished. Installs easily beneath the top mattress. Special strap tightens around mattress for a snug fit. Measures 33"L x 13" H. Ages 1-3 years. Completely removes and stores easily.