Seat height range -16"-21". Standard Nylon Plastic Casters - Industrial strength dual wheels, Smooth Rolling, Easy Turning, Hooded Caster Made in the USA - Easy to clean - The Chair Master PRS chair line was designed and assembled here in the USA specifically for the home garage, shops, and Industrial environments. Whether you are in the home, office, exam room, production line, manufacturing floor, or workshops and you need a durable work seat that can easily be cleaned, our Round Vinyl chairs are built for the job. Comfort and Adjustability - Our research team has designed these chairs to fit a wide range of body types and work environments. All models have adjustable back height, back angle, seat depth, and seat height to provide comfort through a variety of work demands. We offer different models for a wide range of seat height options for different tasks, stations, and work environments. Ergonomic design - Back Height, Back Angle, Seat Depth, Seat height and Foot Ring Height (optional) adjustable. Integrated Lumbar Support, Waterfall Front Seat Design and molded foam for the seat and back that will allow you to focus on the job at hand. - Heavy duty and durable - Comfortable 17.5" round seat, 26" Base, and Class 4 cylinders are standard on all PRS chairs. All components undergo rigorous testing to quality for our 450 lb seat capacity. Easy to Clean with Soap and Water or sanitizing wipes. **10 Year Warranty** Chair Master Round Vinyl seats were designed for comfort and durability. Made with high quality durable vinyl for ease of care and cleaning. Our stools were designed for laboratory, healthcare, and clean room environments but also suitable for school, home, office or an industrial setting. With a large 17.5" diameter seat, comfort molded foam, and robust 26" base, the chair offers comfort, stability and support for extended periods of usage. We offer different models with 5", 8", and 10" of seat height travel to fit your needs in either your home garage, shop, workplace, or industrial work bench. Extremely Durable and Easy to Clean. All of our chairs meets or exceeds ANSI/BIFMA furniture standards, Clean-room class 10,000 and CAL117 fire standards. Tested for 450 lbs of seating capacity. Please Note: Caution for use by individuals over 350 pounds should note that the seat may compress an additional 1"-2". Warning if casters are used, the chairs can roll away when being boarded, causing harm to the individual.