supply of 29258431-set of nitrile rubber o ring , set of nitrile rubber o ring consisting of two items as follows: (i) dia 280 mm x 4 mm c d, qty. =01 no. and (ii) dia 205 mm x 3 mm cd, qty. = 01 no.as per els/tata drg. no. tata/rs/misc/ 13/1, (alt-1). material - nitrile rubber, test certificate to be given from nth or any other govt.approv ed test agency along with material. shelf life of this item is 24 months( 2 years) being the material is nitrile. [ warranty period: 24 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]