Gravel Aggregates Supplier Crushed Stone Aggregates. Supplier of premium aggregates graded and quality guaranteed washed and screened aggregates Commercial grade sizes of 6mm 9mm 13mm 19mm 22mm 30mm 4080mm Available in dolomite granite Quartz and Silica Multiple decorative colours of brown worcester white silica pink and red earthly colours Free delivery in Johannesburg Pretoria .