Once they are ready to transition to a bigger bed, these easy-to-install rails can help protect your little one. Converts crib into a full size bed. Compatible with Annie Elite, Berkley 4 in 1,  Berkley Panel, Berkley Classic, Berkley Round Top Panel, Berkley Elite, Bridgeport, Brittany Panel 4-in-1, Fairview,  Glendale, Katherine, Lynn,  Madrid, Palisades, Urban and Yorkshire Cribs. 1 year limited manufacturer's warranty.