1. Great for drilling square holes in wood with a mortising machine or a mortising attachment. Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects.2. With long drill core and square chisel, easy to lock the hole on the wood, can reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs.3. Suitable for mortise and tenon machine with double effect, and electric drill, hammer and other tools is required for punching square hole in wood.4. Mark the position of the hole and use the hole drill to make a hole. After removing the core, use a square hole jacket to align the position of the hole. The square hole continuously and slowly and you can get the square hole.5.