METAL FRAMING, BACK TO BACK COMBINATION 2 CHANNEL(S) SOLID CONFIGURATION 1.462 SQUARE INCH CROSS SECTION AREA 12 GAUGE THICKNESS 20 FT LENGTH 1-5/8 INCH WIDTH 4-7/8 INCH HEIGHT COLD FORMED PROCESS LOW CARBON STEEL MATERIAL PRE GALVANIZED 4.969 LB/FT WEIGHT B12A MODEL B-LINE B12AGALV20 BACK TO BACK CHANNEL