Arborjet Supersonic Air Knife LTThe Arborjet Supersonic Air Knife LT is the game changing ultra light pneumatic soil excavation tool for vertical mulching, radial trenching, bare rooting, and more! Hook this baby up to an air compressor (not included) and you'll be breaking up the soil particles quickly and safely. With the Air Knife, you don't have to worry about causing damage to tree roots or buried utilities while digging in any type of soil. Once you've dug your hole, you can