How about seven eyes sand?

Seven eyes sand is good. According to relevant data, sand can be divided into five-mesh sand, seven-mesh sand and nine-mesh sand according to its thickness (5, 7 and 9 refer to the mesh number of sand leakage screen of the sander). The more sieve holes, the finer the sand, so the seven-hole sand is medium-fine sand. Fine sand is used to paint walls, building walls, etc. Coarse sand is used for pouring concrete, laying floor tiles and floor heating. Medium and coarse sand can replace the above two kinds of sand.