FREE SHIPPING) 1.5" sch40 (1.9"outside diameter x 0.145" wall) aluminum pipe frame. With 2"x 2"x 3/16" aluminum angle for fastening table top boards and seat boards. Comes with all stainless steel hardware included. Designed to lag bolt the boards on from underneath no bolt heads or lag heads showing on top of table. All you need to purchase is lumber why pay to ship your lumber when you can get it at your local lumber yard. Its designed for 2"x 6"x(length of table)or 2"x 12"x(length of table) lumber. Guaranteed to never rust.