supply of backing ring (fitted flanged & non-vented) for upgraded ctrb class e (6 x 11) (narrow jaw) . , backing ring (fitted flanged & non-vented) for upgraded ctrb class e (6 x 11) (nar row jaw) used on freight stock as per rdso approved nei drg. no. rbsd-7111( narrow) (rev. nil), p art no. 09 and part drg.no. pesd-6088 of m/s nei. other technical requirements confirming to latest rdso approved qap of m/s nei (reference: mw/wad/ctrb/e-class/nei dated 17.08.2023) against st r no. ab/ rb-40-2016 (rev.2). [ warranty period: 48 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]