How to Select Gravel Sizes | Hunker
Apr 19, 2018· For a patio, select gravel that is 3/8 to 3/4inch in diameter. A driveway needs layered gravel to provide stability for vehicles. Start with a layer of stones about the size of baseballs or softballs, with a diameter of 3 to 4 inches. Next, install a layer of 2 to 3inchdiameter stones.