Comparison : Item # PFGB838060, Fiberglass, Extren Fiberglass Series 500, Flange Beams, 2 x 1/8 inches
Item # PFGB983850, Fiberglass, Extren Fiberglass Series 500, Flange Beams, 3 x 1/4 inches
Item # PFGB983852, Fiberglass, Extren Fiberglass Series 500, Flange Beams, 4 x 1/4 inches
Item # PFGB983855, Fiberglass, Extren Fiberglass Series 500, Flange Beams, 6 x 1/4 inches
Item # PFGB838690, Fiberglass, Extren Fiberglass Series 500, Flange Beams, 6 x 3/8 inches