3/8 inch to 1 inch crushed. 21AA. Natural Crushed Stone with fines. 1 inch crushed stone with fines. (used under asphalt or on inclined areas sets up well and does not wash out easily) Peastone. 3/8 inch Natural Round Peastone (used for drainage) Rail Road Ballast. 3/4 inch to 2 inch Crushed Stone .
Crushed gravel, on the other hand, is produced by the natural processes of weathering and erosion, and typically has a more rounded shape verses the angular surfaces of stone. This material comes in sizes generally ranging from less than a half inch up to 20" in diameter.