tender for set of the head bolt m10x30 with spring washer & hex nut for dirtcollector of air brake wagons.(1)- as per rdso drg.no. wd-92051-s-05 item no.8, alt. no.05 for bolt. (2) as per rdso drg. no. wd-92051-s-03, item no. 8 & 9, alt. no. 4 for springwasher & nut (3) each set consisting 04 nos bolts with spring washers & hex nut.