This Regalo Crib Rail is perfect for those restless little sleepers. This crib rail has an all-steel construction to make it very sturdy and durable. The Regao Crib Rail has 16" tall sidewall and is 33" Long for added security. The Exclusive Gap Guard feature prevents your child from sliding between the mattress and crib rail. It's easy to set up with no-tool required. Only for use with a crib.