Screened Rock 1″ / 1″ Natural April 26, 2019 / River Run Crushed, Rock Products / By Tori Jones Size: 1″ River Run Round Rock down to sandSometimes called 1″ NaturalCommon Uses:In Concrete Mix; 5 shovels of rock per shovel of cementPipe BeddingFine Grading Underneath Concrete Slabs