Stone dust fines with up to ¼" crushed stone that can be used for walkways, stables, barns, tennis courts, horse rings, and bicycle trails. CR-6 Fines with up to 1 1/2″ Crushed Stone A mixture of coarse and fine stone that can be used for sub-base for parking lots, roads and highways, as well as for residential driveways, walkways, paver ...