Aggregates Recycled Aggregates 10mm Recycled Aggregate Crushed concrete and brick, with minimal fines, with a nominal particle size of 10mm. For use as a free draining material, retaining wall backfill, under pipes, slabs etc. 20mm Recycled Aggregate Crushed concrete and brick, with minimal fines, with a nominal particle size of 20mm. For use as a free draining material, retaining wall backfill, under pipes, slabs etc. 40/20 Recycled Aggregate Crushed concrete and brick, particle sizes nominally between 20mm and 40mm with an average of approximately 30mm. Minimal fines, perfect for back-fill behind retaining wall and site access roads, reducing contamination carried onto streets from construction / demolition sites. Natural Aggregates 40/70 Rail Ballast 40-70mm graded rock. Perfect for truck driveways, all weather access, backfill behind retaining walls. 7mm, 10mm, 14mm and 20mm Blue Metal (Natural/Quarried) - Sydney Water Spec A quarried aggregate, with minimal fines, with a nominal particle size of 10mm. For use as a free draining material, retaining wall backfill, under pipes, slabs, truck driveways, all weather access, backfill behind retaining walls etc Gabion Blue Metal Gabion Blue Metal, commonly used for gabion rock baskets, landscaping, drainage etc available in multiple sizes such as 75-150mm , 100-200mm, 100-300mm and more Decorative Aggregates Decorative Aggregates Decorative aggregates suited to landscaping and driveways. Our terracotta provides an excellent & cost effective alternative to quarried Scoria rock. Contact us to confirm availability. Round River Rock Round River Rocks / Pebbles are available in multipole sizes ranging from 10mm up to 150mm. Most common use is for decorative landscaping.