"I bought two of these for fitting a door into normal bricks, previous ones I have bought have been OK but recently snapped my last ones (I always like to keep a spare or 2).
The first bit snapped on its 5th hole and the second did the same after about 10. The tips still looked perfect bit snapped about 10mm down. That makes it 4 erbauer bits like this that have broken in 4 days.
Maybe ok for the odd hole but not for regular use so will be returning these asap and buying quality from elsewhere"