retro reflective sigma sign board complete with gi flats & bolts as given (i) size- of board 600 x 450 mm (ii) specification no.-eti/ohe/33a (12/967) rev. 8.3 or latest drg. no.- ti/drg/ohe/plt brd/rdso/0/00036/12/0.4 . accessories- (a) gi flats washer 5 x 450 mm=4 nos. with each boards (b) gi bolts size 12 x 300 mm full thread = 04 nos. with each boards. [make - core approved sources only]