Another optional finishing attachment is the 3- or 4-bar tubular harrow. It features five adjustments for tooth angle. These angle adjustments allow the user to set the aggressiveness of the harrow to the ground conditions and amount of residue on the soil surface. The tines are 5/8 inches (.2 cm) in diameter and 26 or 30 inches (66 or 76 cm) long, depending on the tool they are attached to.