Gem Bids For Supply, Hollow Blocks Of Size 400Mm X 200 Mm X 200Mm As Pertechnical Specification, Cement Opc 43 Grade In Poly Bagof 50 Kg Each As Per Technical Specification, Graded Stoneaggregate Coarse 20 Mm As Per Technical Specification, Sand Coarse As Per Technical Specification, Quick Settingcompound As Per Technical Specification