tractor mounted Terra Rake, 4 rows of tines for obstruction-free dethatching. Tines designed not to clog. Highly effective at speeds up to 15 km / hr. Combination of velocity and vibration helps productivity. Tine depth adjusted via set of castors � Brings thatch to the surface along with rogue grasses (natural). Regular use will help ball roll and playability (artificial). Spring relief kit for loosening the infill on artificial turf fields. 5 year warranty for tine breakage. Ideal for uneven surfaces. Load relief kit helps with adjustment to individual surface.