Being made of carbon steel it hasn't withstood prolonged use. I drilled 6 25" holes in standard sized wood before it wore out and could no longer adhere to the wood and work. In addition, the drilled wood is not evacuated up the groove. It only hardens at the tip and stops penetrating. I even took it to someone to have it sharpened and they told me it was too worn to be retuned. I drilled 6 holes and that's it! Those 6 holes only gave me 40% of my project. Now I have to buy a new one, but it won't be.