Made of heavy duty cold rolled steel and featured with 7cm/2.76in helix diameter, these auger stakes are sturdy and strong enough to ensure maximum digging performance, which can be inserted deeper into the ground. A great helper to improve landscapers' efficiency when planting bulbs, potted plants, vegetables, flowers, bare root trees and shrubs, tilling soil or planter boxes, mixing seed, soil, fertilizer, etc.. Our ground augers can easily drive down with power drill, torque bar and wrench. F