Hang tough with the TaskMaster Economy Industrial Chair. It offers an additional 10" of Wave Tube Extension. Ergo knob controls for 3" backrest depth and 3" backrest height adjustment. Each chair features a 5-leg, tubular steel base with high-impact nylon glides for safety and stability. Sturdy, ergonomically correct low-rung polypropylene footrest mounts securely to base. The chair also features a black microcellular, self-skinning polyurethane foam covering.