Features Extend the life of your Winston 4-in-1 Convertible Mini Crib (sold separately) and provide years of additional use by converting your crib into a beautiful Twin-size bed The conversion rails are finished with the same multi-step staining process and matching hardware to ensure that the Winston Crib (sold separately) seamlessly transitions into any room in your home Hand-finished in a non-toxic multi-step staining and painting process, making every piece one of a kind Fits 37" box spring and mattressSpecifications Suitable for children from 48 - 72 months Compatible with the following (sold separately): Winston 4-in-1 Convertible Mini Crib Manufacturer's 1-year warranty