Transferring and lifting can injure your back! The Optional Bath Chair Shower Base is offered to minimize that risk. The Shower Base can be added to any size Columbia Medical CONTOUR SUPREME or CONTOUR DELUXE TILT-IN-SPACE Bath Chair. This Shower Base allows you to transfer your child from his/her bed directly to the Shower Chair. It can be adjusted to two different heights: 16" or 24". Measures 17" width x 28" length. PLEASE NOTE: Four Locking Casters AND Anti-tippers are included with this item.