Wood Drill Bits – Charts and Reviews
Most these are made from steel, high speed steel (HSS) and cobalt steel. In the main this will determine how long tool actually last. For the most purposes HSS drills are ideal for drilling.
The Twist ones are all rounder type of commonly used tools.
Brad Point Drills are really good for drilling as they have a point, known as a brad, for really accurate positioning. They also have extra wide flutes which help remove the chips and shavings.
Auger Bits have a screw tip thread to start the hole, and it then uses this to pull the bit through material to make the hole.