Gravel Road Base 2.5 1m3. This product can be used in a variety of applications. You can fill in holes, create driveways, use under pavers or concrete slabs, or anywhere that requires compaction or a hard surface. Road base is a crushed rock about 20mm in size, mixed with smaller particles and fines. This allows the product to compact down extremely hard providing a very firm and stable surface. To harden this surface further and stop washout, mix with cement and whacker pack. Can supply 2.1 road base for Civil works.