The Viking Adjustable Mechanic's Rolling Stool, No. 57104, features high-density foam to provide maximum comfort for all-day use and a large tool tray to keep parts within reach. With a hydraulic piston, the stool adjusts from 15.6" to 20.4". The five professional-grade polyurethane swivel casters resist corrosion and are designed to provide easy movement even over cords, cracks, and debris. Made from heavy-duty construction, the stool supports up to 300 lbs and its easy-to-clean upholstery is resistant is most shop chemicals.