procurement of 6 sets of grinding elements with buyback for stage-1 boiler.-1 grinding ring, top, indigeneous for ball mill 10e10 , initial depth of ring-105 mm 2 grinding ball , indigeneous, 770 to 774 mm for ball mill 10e10 ( 1 set=10 balls ) , ball od: 770-774 mm, id: 520 mm 3 grinding ring, bottom, indegenious for ball mill 10e10 , initial depth of ring 100 mm.ms, band ( dimension 25 mm thick x100 mm width ) is required t o be shrink fit with bottom grinding ring for fixing of rotary throat 4 grinding ball, fill in, indigeneous for ball mill 10e10 size, 699 to 702 mm, ball od: 699-702 mm, id 520 mm 5 buy-back of used grinding elements ( 1 set of grinding element comprising 1 no. worn out top ring & 1 no. worn out bottom ring and 11 nos. of worn out balls. )