Duct hanger,c channel,support channel - Size: Size: 27*15mm, 41*21mm, ... - Thickness: 1.2 mm ~ 2.5 mm(12 - 19Gauge Duct hanger,c channel,support channel Octopus Metal offers galvanized channel which ... - 6 -- Material Available: Pre-galvanized, Hot Dipped Galvanized-- Spring nut, bolt, nut & washer are available.