540 Hydraulic Lift Reliance Stool The most economical stool in the 500 series, features 15″ seat diameter and a convenient foot pedal that raises or lowers the stool. A lift of the foot pedal locks the stool’s seat. Features 19.75″ diameter base Standard height elevates seat from 17″ to 25″ above the floor. Medium seat height for surgical use is 20½” to 28″. High seat height is 24 to 31½”. Exceptional stability even in the sit-stand position Stool legs also extend beyond seat’s circumference to provide stability in the sit-stand position Mobility is provided by rugged 2½” casters molded from hard rubber. Soft rubber casters may be specified as an option for use on hard floors. All exposed metal with the exception of the aluminum base is chrome-plated steel; base and legs are finished in tough, epoxy enamel Available in a variety of upholstery colors Made in U.S.A.