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Crushed Stone Grades A Complete Guide. The largest of the crushed stone grades. For larger jobs such a culvert ballast. Crushed stone 8 – Sizes from 38″ to 12″. For concrete and asphalt mix. Crushed stone 3 -Sizes from 12″ to 2″. For drainage and railroad projects. Crushed stone 10 also called stone dust – Screenings or dust.