At first I was skeptical because only two cutting blades on the drill are. Other out look like a corkscrew. But since I have already bought other equipment of Fiskars and was always very happy, I thought to myself well here, rather pay a little more, but get something that works well. Immediately after, as always fast delivery I've tried it. Because where I drilled the hole sample were plenty Wuzeln and stones in the way, yet I was after 5-6 minutes already half a meter deep in the earth. The hole is so clean (despite Wuzeln and stones) that I could directly fill the concrete. Only stupid that I as no holes need where I've tried it.