Once your little one has outgrown the crib this Toddler Bed Conversion Rail Kit allows you to easily convert it into a toddler bed. With a simple installation using just four included screws you can extend the use of the crib until your child is ready for a twin bed. Measures 51.5 L x 1.125 W x 13.5 H. Compatible with the Roxane crib M7921* Features: Extends the useful life of your DaVinci crib and converts your crib to a toddler bed Compatible with the Roxane crib M7921* Lead and phthalate safe Non-toxic finish Made of solid New Zealand Pine wood from sustainable forests Measures 51.5 L x 1.125 W x 13.5 H 1 year warranty Rail is not compatible with older model and/ or Drop Side model cribs