supply of a set consist of following items : (a) double sealed window glass unit with polycarbonate sheet and frosted glass (for rtdc coaches) to size : 346x980x25.5 mm. to drg. no. wrctac 1-5-4-004 alt. , a set consist of following items : (a) double sealed window glass unit with polycarbonate sheet and fr osted glass (for rtdc coaches) to size : 346x980x25.5 mm. to drg. no. wrctac 1-5-4-004 alt. c, col. 4 qty. = 01 n os (b) double sealed window glass unit with polycarbonate sheet and frosted glass (for rtdc coaches) to size : 121 0x980x25.5 mm. to drg. no. wrctac 1-5-4-004 alt. c, col. 5 qty. = 01 nos (c) double sealed window glass unit wi th polycarbonate sheet and frosted glass (for rtdc coaches) to size : 1362x980x25.5 mm. to drg. no. wrctac 1-5- 4-004 alt. c, col. 1 qty. = 01 nos. (d) double sealed window glass unit with polycarbonate sheet and frosted glas s (for rtdc coaches) to size : 1514x980x25.5 mm. to drg. no. wrctac 1-5-4-004 alt. c, col. 6 qty. = 01 nos (01 s et = item a + item b + item c + item d) [ warranty period: 30 months after the date of delivery ] ]