Three rails: 1-1/2" x 1-3/8" x 1-1/2" x 11g U-Channel
3/4" x 18g pickets.(16g and solid pickets are also available as well as 1" sq. pickets size.) All pickets are riveted to the horizontal rails provide maximum possible strength and rigidity to the section.
2-1/2" x 14g post (12g also available as well as 3" - 8" Sq. ranging is wall thickness).