This document discusses M-sand, which is manufactured sand produced from crushing granite stone and used as an alternative to river sand for construction purposes. It has several advantages over river sand, including consistent size and shape, higher strength, and lower cost. The manufacturing process involves primary and secondary crushing using jaw crushers, cone crushers, and other crushers to break the stone into uniformly sized particles under 4.75mm. Vibratory screens then separate the sand by size for use in concrete. M-sand provides benefits like higher strength, durability, and workability when used in concrete.