Woodworking blind hole drill bits include three-point blind hole drills, with the drilling tip having three points, an acute angle less than 180°, and a guiding part with spiral grooves. The tip of the teeth is usually flat, unlike the pointed tip of through-hole drills. This design allows the bottom of the drilled hole to be more even.To ensure the hardness and wear resistance of the drill bit, the cutting part of woodworking blind hole drill bits is often made of carbide, while the shank is made of metal. There are straight shanks and hex shanks. Straight shanks offer high holding stability, while hex shanks provide strong anti-torsion capability and facilitate quick tool changes.