supply of improved high tensile tight lock centre buffer coupler with aar -h- typeimproved high tensile tight lock centre buffer coupler with aar -h- type,improved high tensile tight lock centre 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.1) consisting of 6 items. sl.no.1.tight lock coupler head aar -h- type with main pin- qty-1 no., sl.no.2. balanced draft gear- qty-1 no., sl.no.3.supporting device with fasteners- qty-1 no., sl.no.4.manual uncoupling device- qty-1 no., sl.no.5. base plate with fasteners- qty-1 no., sl.no.6. support plate with fasteners- qty-1 no. [ warranty period: 30 months after the date of delivery ]