About #73 Crushed Limestone. It is a material 3/4" to fines, This type of gravel base is used mainly for base material underneath patios, walkways, sidewalks, driveways, under Pavers, Flagstone and Steppers, walls, or even just a gravel driveway. It is great for compaction. It is a finer product than the #53. Size Variation: Please allow for up ...