supply of flap door assembly (modified) for boxn wagon etcflap door assembly (modified) for boxn wagon etc,flap door assembly (modified) for boxn wagon. drawing no.: rdso,s drg. no. wd-23018-s- 01, alt. 1 , item nos. 1, 4,5,6, 7, 9, 10 & 19 are in assembled condition. material and specification : as per drawing. remarks: considering that flap door is a weight sensitive item, inspection should cover sample check of weight to ensure that the same is within the tolerances derived from tolerances permitted on raw material of each parts as per the respective bis specification of raw material of that part [ warranty period: 30 months after the date of delivery ]