1)pre galvanized. 2)steel material Q195 3)with one steel coupling and one blue plastic cap 4)size:20mm,25mm,32mm,40mm, ... 50mm BS4568 G.I Electrical Conduit pipeFeatures:1) Hot-dip,electro-galvanized inside and outside surface,the thickness of zinc galvanized ... ,25mm,32mm5)Material: Steel6)Package: bundle Hot dip galvanized steel class 3 and class 4