Three tips carpentry drill easy to locate, high speed cutting when, the wood is powder, which is usually used to process small holes.
Brad point drill bits is generally used to process large workpiece holes, wooden structure houses and furniture merchants' large holes. Step drill, generally to save time, use step drill(Non pagoda drill) drilling, can be used directly countersunk head screw, make sure that the center of the two round holes is in a straight line.