2020-S-B Royal II White Step For 48'-54" Above Ground Pool In Box. The Royal II is compact and practical, and has been specifically designed to fit above ground pools 48′′ to 54′′ in diameter with varying pool floor levels. It features an easy-to-use front-loading ballast that simplifies removal and winterization, and it protects your pool liner with our step cups system. Additionally, it can be installed on an undecked pool using the Classic Ladder #6007 or the Self-Latching Ladder #9700.