Forstner Drill Bits
Forstner bits are superior bits for drilling wood because they are guided by the rim and not a centre point. Hence they are not deflected easily by the natural differences in hardness found in timber such as knots or strong grain patterns. They can be used to be bore in any direction and are extremely useful for boring holes on an angle or to true up and increase the size of an existing hole or timber imperfection.
The design permits large chips clearance easily and this combined with their ability to track truly makes them especially suited for drilling deep or extra large holes.