This sieve riddle is the ideal garden tool accessory for removing stones and debris from soil and aerating soil or compost Made from durable green powder coated metal, each riddle is strong and known for their longevity and performance. The metal garden riddle sieve is a garden tool that can be used in your garden for many different purposes. Whether its to clear debris from gravel, separate sand and gravel, remove cut debris and stones to make the soil finer for vegetation. This large garden riddle is useful to create the ideal growing conditions for seeds and seedlings.