Comparison : Item # PFGB838769, Fiberglass, Extren Fiberglass Series 500, I-Beams, 2 x 1 x 1/8 inches
Item # PFGB838044, Fiberglass, Extren Fiberglass Series 500, I-Beams, 3 x 1 1/2 x 1/4 inches
Item # PFGB838654, Fiberglass, Extren Fiberglass Series 500, I-Beams, 4 x 2 x 1/4 inches
Item # PFGB838674, Fiberglass, Extren Fiberglass Series 500, I-Beams, 6 x 3 x 1/4 inches
Item # PFGB838694, Fiberglass, Extren Fiberglass Series 500, I-Beams, 6 x 3 x 3/8 inches