National Public Seating standard folding chair with double brace. Made with your comfort in mind our 50 series standard all-steel folding chair features a heavy duty 19-gauge round tubular frame with a frame strengthener on each side of the seat. Two U-shaped, double-riveted cross braces; one in front and one in back are designed to keep the frame well supported and completely secure. Seat is designed with a waterfall front for added comfort. A contoured back features curled safety edges and is electromagnetically welded to the frame. Color-coordinated V-Tip plugs provide added stability at the frames junction. The Body Builder line chair. Features 19 gauge 7/8" round tubular frame with 2-1/4" frame strengthener. Powder-coated frame. Two 19 gauge 5/8" U-shaped double riveted cross braces. Single hinges on each side for added stability and durability. Color coordinated polypropylene glides. Measures 18-1/4" width by 29-1/4" height by 18-1/2" depth. Folded measures 18-1/4" width by 38" height by 2" depth. Seat measures 15-3/4" width by 16-3/4" height by 16" depth. Back measures 18-1/4" width by 8-3/4" height. 10 Years warranty. MAS Certified Green. Products meets or exceed applicable ANSI/BIFMA standards.