50 Series All-Steel Folding Chair, Supports Up to 500 lb, 16.75" Seat Height, Black Seat, Black Back, Black Base, 4/Carton Two 19-gauge 0.63" U-shaped double riveted cross braces add extra strength to the frame. Features 19-gauge 0.88" round tubular frame with 2.5" frame strengthener. Electromagnetically welded seat back. Single hinges on each side for added stability and durability. Color coordinated polypropylene glides and V-Tip plugs for added stability. Powder coated frame. Tested by Bureau Veritas to support 500 lbs static load capacity. Our Price Buys you: 4