Feb 22, 2020 Crusher Run stone is a quarried material that is crushed to particular sizes. It has the fines, or dirt, left in it which causes the stones to bind together which makes it the perfect driveway gravel.Can also be used in building walkways, using under patio stones or a base for pavers. Crusher run is comprised of crushed stone and stone dust. Typically 2 pieces down to fines, It can also be 1-Fines or 3/8-Fines. Can contain pieces up to 6. If you are needing a specific size then we suggest you ask for the size available in your area. Crusher Run is an extremely compact-able material used for driveways and sub-bases.