Gravel crusher,gravel crushing machine,gravel. Both sand and small gravel are also important for the manufacture of concrete. gravel crusher sale gravel is rock that is of a specific particle size range. gravel can be sub-categorized into granule 2 to 4 mm0.079 to 0.16 in and pebble 4 to 64 mm0.16 to 2.5 in. recommended machinery jaw crusher ...