The Soho Baby Ellison Crib to Full-Size Bed Conversion Kit is thoughtfully designed to extend the life of the Soho Baby Ellison 4-in-1 Convertible Crib. With the included hardware, simply attach the crib headboard and footboard to the coordinating side rails and place the included five slats across. Convert to a full-size bed as your child becomes independent and transitions from crib, toddler bed, or daybed into a full-size bed. The use of a Bunkie Board or box spring with this conversion kit is recommended and sold separately.