New in unopened box pottery barn crib Graham conversion kit. Overall: 55.5″ long x 28″ high x 2 thick. Guardrail Opening: 21 wide. Weight: 12.5 pounds. PB conversion kit makes it easy to transform the Graham 4-in-1 Convertible Crib into a toddler bed for lasting use, style and comfort as your child grows. HOW IT IS CONSTRUCTED. Toddler conversion kit is crafted from solid oak wood. Kiln-dried wood helps prevent warping, splitting, cracking and developing mildew. Finish is applied by hand using child-safe, water-based paint in Heritage Fog, which provides durability, richness and depth of color to each piece of furniture.