... .British standard condiut 3.BSI Approval Electirical Conduit1.The BRITISH CONDUIT standard galvanised pipe is formed with high quality welded tube ... ",1",1 1/4",1 1/2",2"3.Steel Conduit Standards:BS31-1940 SizeOutside Diameter(mm)Wall thickness(mm)Length ... ±3%4.Packing100pcs/bundle,1 white plastic bag/bundle Electrical Conduit