Drainage Gravel (40mm)Our drainage gravel consists of a crushed blue metal screened to 40mm in size. At this size it is suitable as rubble pit drainage and is often used on job sites as rubble for truck access. It is compactable if you require a smoother or more even surface and is resistant to erosion and weather. It is perfects for stabilising muddy areas and does a great job of securing the earth and therefore reducing the dust and dirt around your workplace. Drainage