Metal Conduit of Class 3 1.Steel,ISO9001 2.Pre-Galvanization 3.20mm,25mm,32mm 4.BS31,BS4568 and BN50086 Standards Item: ... Metal Conduit of Class 3Material:SteelFinish:Pre-galvanizationSize:20mm/25mm/32mm, 3/4",1", 1-1/4"Types ... .6mm-1.6mm3m-6m steel pre-galvanizationclass 3 conduit25mm/ 1"0.6mm-1.6mm3m-6m steel pre-galvanization Metal conduit of Class 3