Hole Enlarging Drill Bits
20 sizes for choosing: 6mm/6.4mm/8mm/9.5mm/10mm/12mm/12.5mm/12.7mm/14mm/15mm/16mm/18mm/19mm/20mm/21mm/22mm/25mm/26mm/28mm/30mm
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. Mortise and tenon square hole drilled by the terrible + outer sleeve in the middle of the combination.
Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.
Arc design, exquisite sharpen
Use matters: Square hole drill is mainly used for woodworking aspects.