Ⅰ. The head of the garden auger is made of manganese steel, and the shaft is made of A3 steel, which is durable and not easy to deform. The surface with glossy black painting protects the garden posts well from rust. Ⅱ. The spiral design ensures efficient soil digging and unloading without difficulty. Ⅲ. Use the drill at low speed (slow), then drill into the ground or suitable landscape, the auger easily digs a hole in seconds and works well even in slightly hard soil. Ⅳ. Note: Not suitable for large rocks or hard stones. Ⅴ. Both garden bits are suitable for any drill with a 3/8 or larger chuck. But it is better to use drills with a power of 18V or more (at least 14V for cordless drills) to have a better digging experience and save working time. Ⅵ. This set includes two auger bits 40 x 220 mm and 80 x 300 mm. They are used to dig holes with a diameter of 40mm/80mm and a depth of 220mm/300mm. Helps to plant a wide range of plants of different sizes, very useful for creating a garden. Ⅶ. These spiral bits are suitable for professional landscapers, suitable for planting bulbs, potted plants, flowers, bare root trees and shrubs, tilling soil and mixing seeds. Ⅷ. Always keep the drills clean after use for better use. Ⅸ. Quantity: 2pcs. Ⅹ. Product color: black Ⅺ. Product size: 8* 30cm , 4*22cm