Single is natural gravel and is significantly rounder than makadam, which is machine-crushed rock. This means that makadam is considerably more stable as a base and is preferable if it is to carry a load. If you mean around the plinths, you can use either, but I would probably choose makadam underneath them.
Thanks, now I know!jon_h said:Gravel is natural small stones and is significantly rounder than macadam, which is mechanically crushed rock. This makes macadam significantly more stable as a base, and it is preferable if it is going to bear any load. If you mean around the pillars, you can use either one, but I would probably choose macadam under them.
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