Grade: 0-7mm. Daltons PAP7 (Crusher Dust) is the ideal solution for any situation where a firm sub-base is required. For use under pavers, cobbles, slabs, drainage pipes, water tanks or anywhere a hard sub base is required.Easily spread and easily compactedIf laying pavers, a thin layer (5-10mm) of Daltons Washed Sand () will make it easy to bed …