supply of improved high tensile tight lock center buffer coupler.improved high tensile tight lock center buffer coupler., improved high tensile tight lock center buffer coupler with aar-h type head and balanced draft gear for fitment on bg passenger coaches confirming to rdso specification no. rdso / 2011 / cg-03 ( rev.-3 ) co nsisting of 6 items, sl. no. 1. tight lock coupler head aar-h type with main pin. qty. 1 no., sl. no. 2. balance draft gear. qty. 1 no., sl. no. 3. supporting device with fasteners. qty. 1 no., sl. no. 4. manual uncoupling devic e. qty. 1 no., sl. no. 5. base plate with fasteners. qty. 1 no. and sl. no. 6. support plate with fasteners. qty. 1 n o. matl. & spec. : rdso / 2011 / cg-03 ( rev.-3 ) . [ warranty period: 84 months after the date of delivery ]