Tender For supply of retro-reflective power block working limit board size: 450 x 450*2 mm with comp lete fitting fasteners as per rdso spec. no. eti/ohe/33a (12/97) rev-8 or latest. rdso drg no. eti/ohe/p/ 7574 rev b or latest. the material for base plate should be aluminum alloy sheet (is 737-1986) and materi al for numerals/symbols/letter should be made of retro-reflective high intensity micro prismatic sheeting (ty pe-iv) [ warranty period: 30 months after the date of delivery ]