STAINLESS STEEL SEAMLESS PIPE OF SIZE 20 mm NB ( OD- 26. 67 mm ) X ( 6 MTR X 45 NO ' S ) ( +/- 0. 25 MTR. ) LONG OF SCHEDULE- 40S ( WALL THICKNESS 2. 87 mm ) OF SEAMLESS & ANNEALED QUALITY ( HARDNESS 75- 80 HRB ) CONFIRMING TO ASTM- A 312 GR. TP 304. ( PIPE SHALL BE MARKED/ ITCHED WITH MANUFACTURERS DETAILS WITH NAME/ LOGO/ YEAR/ HEAT NO AT EVERY METER LENGTH )