15 Mm Galv. Steel Tubes Medium Grade Is: 1239 Part-I/2004 Both Ends Screwed One End With Socket And Other End With Plastic Thread Protector, Randum Length Of 4 To 7 M Continuously Welded Electric Resistant Weld(Erw), High Frequency Induction Welded(Hfiw), Hot Finished Welded (Hfw) Light Coated Isi Mark And Socket Also To Be Isi Marked Confirming To Is: 1239 (Part-Ii)/2011.