Seat height is adjustable with a 10" pneumatic lift for workbench and high table applications. Steel-spring back with manual adjustment up and down and in and out. Welded steel 5-star base with telescoping polypropylene cover, loop foot rest and floor glides. Chair measures 24"W x 24"D x 34 to 51½"H overall. Solid molded self-skinned polyurethane seat and back in Black. Some assembly required.