05 12 00 Structural Steel Framing 05 00 00 Metals 05 21 00 Steel Joist Framing
CSI Codes : 05 00 00 Metals, 05 12 00 Structural Steel Framing, 05 12 00 Structural Steel Framing, 05 21 00 Steel Joist Framing, 05 00 00 Metals