This replacement 6" Wheel is reliable and can be easily insalled with the S.R. Smith Vista Lifeguard Chair. S.R. Smith leverages technology, design and materials to expand swimming pool utility to help owners get more from their pool investment. The Vista lifeguard chair comes in either 6' or 8' heights that allow lifeguards to easily scan large pool areas. This easily movable unit allows you the flexibility of moving your lifeguard stations as needed.