Abstract: An asymmetrical drill bit. A masonry-type bit having diametrically opposed, oppositely inclined top walls converging at an apex and having upstanding sidewalls is broken so that diametrically opposed, hollow ground, dished surfaces are formed such that the respective lengths of the top and sidewalls are diminished. The dished portions so formed are asymmetrical to the axis of rotation of the bit, and the structure exhibits a durability that substantially exceeds the durability of symmetrically ground bits.