STEEL HOLLOW SECTION FOR WINDOW can be said (WINDOW SECTION) (STEEL PROFILE FOR WINDOWS) (LTZ PIPE) SIZE: 28*28,29*29,34*34, 38*38THICK : 0.55-1.3MM BLACK AND BRIGHT PACKING : PLASTIC BAG USAGE : FOR MAKING WINDOWS PROFILE AND DOOR QUALITY : Q195-Q235, CAN BE BENDED ,SOFT MATERIAL