24.1.1. All structural steel of domestic origin. 24.1.2. 12’ x 50’ four stringer prefabricated bridge 24.1.2.1. Four (4) steel beams 24” tall x 62 pounds per foot x 50’ long 24.1.2.2. Two (2) outside beams drilled for nailer bolts 5’ on center, both sides 24.1.2.3. All four (4) beams drilled for fastening angle clips for diaphragms 24.1.2.4. Diaphragms to be 12” C-channel x 20.7 pounds per foot (12 needed) so that the beams are 3’5” apart (center to center) 24.1.2.5. Four (4) 3” x 3” x 1/4” thick x 18” long angle iron for clips at each end of each beam for fastening the header (8 total) 24.1.2.6. Twenty-four (24) 3” x 3” x 4” thick x 18” long angle iron for clips pre-drilled for fastening clips 24.1.2.7. PE stamped design letter of certification, drawings, and stringer/deck calculations. 24.1.2.8. All required fasteners and hardware for assembly and deck installation.