Gravel is rock that is of a specific particle size range from 2mm (0.079 in) to 256mm (10.1 in). Gravel rock contains cobble stone (64-256 mm or 2.5-10.1 inch), pebble stone (8 -64mm or 0.32 -2.5 in), sand stone (2-8mm or 0.079-0.32 in). 　　Kefid designs best flow chart with various configuration of equipments to meet […]