Kald Int'l Industry Limited is one of the leading China bs31 gi conduit class 4 manufacturers and suppliers,Website:http://www.kaldint.net, and also a professional company and factory, welcome to buy low price and high-quality bs31 gi conduit class 4 and wholesale our good products.Product: BS31 GI Conduit,Class 4Description:* Hot Dip Galvanized Steel Conduits complying to BS. 31-1940 Amendment No.5.* Hot dip galvanized (Heavy Protection), both inside and outside.* Both ends threaded with one coupler and protected with plastic cap at the other end.* Standard Length is 3.81 meters (10pcs / bundle).Trade SizeDimension:  O.D.*wall thickness*length3/4"19.05mm*1.6mm3.05/3.81m1"25.40mm*1.6mm3.05/3.81m1-1/4"31.75mm*1.6mm3.05/3.81m1-1/2"38.10mm*1.8mm3.05/3.81m2"50.80mm*2.0mm3.05/3.81m