This 21-1/2"W x 21-1/4"D x 31"H chair is made using 15 gauge cold-rolled steel with a scratch resistant black powder coat finish for long lasting durability and dependability. High impact polypropylene seat and back offer resistance to corrosion. Seat and back are contoured for comfort and support. Seat has a waterfall edge seat to improve leg circulation. Back is reinforced with injection aluminum alloy supports for extra strength. Chairs stack up to 15 high when not in use for compact storage. Includes removable armrests for added support. Permanent ganging brackets help create rows of chairs. Seat measures 18"W x 18"D x 17-1/2"H. Back measures 19"W x 13-1/2"H. Withstands up to 400 lbs. Legs include nylon glides for stability.