6-piece Square Hole Drill Bit Set, Square Hole Drill Bit Sets for Woodworking, Mortise Chisel & Bit Set, Square Drill Bits for Hole Saw, 6 Sizes

【High-Quality Steel】This square hole drill bit is made of special steel, heat-treated to HRC48-50, offering high hardness, an elongated core, and high concentricity.Sharp blade, continuous cutting, fast cutting, high efficiency.【How to Do the Work】: The square drill bit is driven into the pre-drilled hole by the rotating body. The impact force is transmitted to the outer body, grinding the material through the round hole and the square head wall, and the debris is discharged from the tube.【Labor-Saving and Precise】: This professional mortising chisel is ideal for drilling square holes in wood with a mortiser or mortising attachment.And reduce the workload of construction workers, accelerate construction speed, and lower construction and installation costs.【6 Different Sizes】: 6 pieces in the package with different slot diameters to meet your needs.Comes with 6 different sizes: 1/10.2 cm, 5/40.6 cm, 3/20.3 cm, 1/5.1 cm, 9/40.6 cm, 5/20.3 cm, suitable for drilling various square holes.【Application】: Fits all mortising machines and drill attachments.Square hole drilling is mainly used for woodworking applications.Professional tip, suitable for construction, design, renovation, decoration, etc. Caution: The chisel alone will not work in a wood drill; you need a drill attachment.