Lab stool features a screw lift & low base. Vinyl upholstery & a generously cushioned, 3-1/2" thick seat provide comfortable, long-wearing seating. Seat has a 16" diameter & swivels 360 degrees. Screw lift adjusts the seat height 8" from 17" to 25". Four-leg, 23" diameter base is made of tubular chrome-plated steel & has a footring & 2" hooded, dual-wheel carpet casters. Stool holds 250 lb. and meets or exceeds applicable ANSI / BIFMA standards.