supply of fish bolts and nuts. , fish bolts and nuts for 60 kg to rdso drg. no. t-1899 to alt. 1 with latest alterations if an y, confirming to irs specifications no. t-23-67 with corrigendum no. 5 of october 87 to specifications n o. t-23 with latest amendment. details technical specification enclosed. [ warranty period: 30 month s after the date of delivery ] ] , manufacturing and supply of fish bolts and nuts of size 25 x 180 mm to rdso drg no. t- 11513 alt. 2 or latest alterations if any, use for points & crossing, confirming to irs specifications serial no.t-23: 2021 (redrafted) or latest amendment if any. details technical specification enclosed. [ warr anty period: 30 months after the date of delivery ] ] , manufacturing and supply of fish bolts and nuts of size 25 x 190 mm to rdso drg no. t- 11514 alt. 2 or latest alterations if any, use for points & crossing, confirming to irs specifications serial no.t-23: 2021 (redrafted) or latest amendment if any. details technical specification enclosed. [ warr anty period: 30 months after the date of delivery ] ]