Clay spades are very efficient way of narrow trenching in sticky soils.   Our design differs from others as it has a twin skin that boxes the tine making it much stronger than our competitors. We have the standard versions but also supernarrow version.  With the supernarrow the tine is much narrower than the brackets.  The tine is elongated to give greater digging depth but still has a deep curve to maximise the volume of soil moved each pass