The Hollow Tine Aerator by Handy is a high quality steel construction using sprung diameter tines and a tread plate. This product is best suited for removing a core of 50 mm and it comes with a fold away handle that allows easier use of this product. Quality Steel Construction 5 Sprung 20mm Diameter Tines Removes 50mm Deep Core Collecting Tray for Cores Tread Plate for Easy Use Fold Away Handle Weight: 3.0kg