SEAT SURFACE: ¼” x 1 ½” steel bar and 1 5/16” O.D. steel pipe. SUPPORT: 2 3/8” O.D. schedule 40 steel pipe with 3/16” thick steel top channel. FASTENERS: Stainless steel. FINISH: Polyester powder coated. • Choice of permanent, or surface mount support. MODEL NO. 439 19” Square Steel Bench