METAL FRAMING, BACK TO BACK COMBINATION TYPE; LOW CARBON STEEL MATERIAL; PRE GALVANIZED FINISH; 20 FT; 1-5/8 INCH; 3-1/4 INCH; SOLID CONFIGURATION; 16 GAUGE THICKNESS; COLD FORMED PROCESS; 2.467 LB/FT WEIGHT; 2 CHANNEL(S)