Since these adjustable-height stools withstand chemicals, grease, and repeated washdowns, they are often used in laboratories and food-processing areas. Without a backrest, they fit under tables and workbenches when they're not needed. Turn the seat to adjust the height. The middle of the seat has a nonslip black rubber surface.

Choose a seat height range with heights slightly lower and higher than your ideal setting. Stools up to 23" high fit most comfortably when used with standard 30" high work surfaces, such as tables and desks. Stools that are 24"-27" high are sized for use at standing-height work surfaces that are 36" high, such as workbenches. Stools 28" and higher are meant to be used at extra-high counters that are approximately 40" high.