3/16" thick x 2.5" x 2.5" steel square tube, 4 lengths of 48"
Pictures here
3/16" thick x 2.5" x 2.5" steel square tube, 8 lengths of 6"
3/4" Nuts and 1.5" long Bolts, 8 pairs
3/16" thick x 2.5" x 2.5" steel square tube
3/4" Nuts and 1.5" long Bolts