The only drill bit I've ever tried to use wasn't straight! Wasted a whole day and at the end of the day I'm now in a position where I have to redo all day's work, start over as the drill didn't cut 16mm holes which is all it does should. ! I even took it to a local garage to have it checked out and got it confirmed; NOT GOOD! I need a refund! I recommend everyone to stay away from this product.