that I bought , this is for drilling holes in the stumps on my property so I can pour in the stumps remover and speed up their decomposition. It took me long enough to drill 3 or 4 holes 12" deep before the two points on the bottom started to curve in the direction of rotation of the bit, which didn't impress me too much. For those who need it for some smaller, light jobs. Projects around the house, this nozzle will do the trick. If you're looking for something for hard work or long-term use, you might be better off investing in a more expensive attachment. Price but like everything you get what you pay for.