12' - 6061-T6 Aluminum Association I Beam Aluminum Beam Aluminum Beam 6061-T6 Aluminum Association I Beam 5" (A) x 8" (B) x 0.25" (t) x 0.41" (N) 6061-T6 Aluminum Association I Beam Aluminum Beam Aluminum Beam 6061-T6 Aluminum Association I Beam 5" (A) x 8" (B) x 0.25" (t) x 0.41" (N)