【Solid material】The head of the garden auger drill is made of high quality manganese steel and the shaft is made of A3 steel, durable and not easy to deform. The glossy black painted surface protects garden drill well from rust 【High efficiency】The spiral design ensures efficient digging and dumping of soil without difficulty. Use a low speed (slow) drill bit and then drill into the soil or suitable landscape. The earth auger easily digs a hole in seconds and works well even in slightly hard soil. Note: Not suitable for large rocks or solid stones 【Suitable machine】The two garden drill bits work perfectly with any drill with a 3/8 inch or larger chuck, but it is better to use drills with 18V or more power (at least 14V for the cordless drill) to get a better digging experience and save money on working time. 【2 different sizes】This set includes two auger bits 40 x 220 mm and 80 x 300 mm. They are used to quickly dig a hole with a diameter of 40 mm/80 mm and a depth of 220 mm/300 mm.