METAL FRAMING, BACK TO BACK COMBINATION TYPE; ASTM A525 GRADE 90 STRIP STEEL MATERIAL; PRE-GALVANIZED FINISH; 20 FT; 1.625 INCH; 3.25 INCH; SOLID CONFIGURATION; 12 GAUGE THICKNESS; COLD FORMED HOT ROLLED PICKLED PROCESS; 2 CHANNEL(S)