supply of gasket set made of rubberized cork sheet suitable for 25- 100 kva tf ( ii ) supply of gasket set made of rubberized cork sheet , gasket set made of best quality rubberized cork sheet rc-70c as per is 4253 ( part-2 ) with latest amendment ) for use in repairing of 25-100 kva distribution transformers ) each set containing total 19 nos . washer ( having 3 nos . washer having dia od 110 mm , id 75 , 6mm thickness , 12 nos . washer having dia od 50mm , id 28mm , 6mm thickness and 4 nos . washer od 32 mm id 12 mm , 6mm thickness ) total 19 nos . washer pieces in one set & as per sample . each set will be packed in environmental friendly poly bag . , gasket set made of 6 mm thick best quality rubberized cork sheet , rc-70c as per is 4253 ( part-2 ) with latest amendment ) suitable use in size m-20 for repairing of 250-400 kva distribution transformers ) size m-20 containing different sizes 19 nos . washer pieces in one set & as per sample . each set will be packed in environmental friendly poly bag .