The size describes the sieved state of the stone as it comes out of the quarry crushers.
4mm – 10mm
Perfect for path and driveway finishes.
10mm
Great for bedding pipes and armoured cabling, also for garden paths, driveways, and fence posts.
Mixed with sharp sand for a 10mm Ballast
Extremely versatile, can even be used as mulch to retain on borders and rockeries.
Also great for garden membrane coverage.
20mm
Mixed with sharp sand, a ballast is formed for concrete slabs as well as concrete foundations and footings.
20-40mm and Oversize Ungraded (40-300mm)
Often used for decorative purposes, under trees and on borders. Also very good for drains, cesspits, and soakaways.
You can also replace flints and stones in old walls with rejects.