SBRMART Drill_450 Woodworking Square Hole Drill Bit Mortising Chisel Hole Saw Drill Bit - 12.7mm

Arc design, exquisite sharpen durable. -Square hole drill is mainly used for woodworking aspects. -Mortise and tenon square hole drilled by the terrible + outer sleeve in the middle of the combination. -Square hole drill can not be used on an electric drill, drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use. -Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.