1、TIME SAVING: These woodworking mortises can reduce the labor strength of construction workers, speed up construction, and reduce construction costs in the building, installation, renovation, and decoration industries. 2、MULTIPLE SPECIFICATIONS: Users can use different specifications of square hole drill bits with the right power of square hole machine to make the square holes that meet the requirements. 3、HIGH SPEED STEEL: These square hole bits are made of high speed steel and are heat treated for a high hardness bit and incisive square chisel for long life. 4、EASY TO USE: This drill can be used with a mortising machine to double the effect. Square holes need to be made with a drill, hammer or other tools. 5、PRIMARY USE: These square hole bits are ideal for drilling square holes in wood using a mortising machine or mortising attachment.