Woodworking Mortise Bits

. This Mortising Chisel is great for drilling square holes in wood with a mortising machine or a mortising attachment. 2. 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. 3. Mortise and tenon square hole drilled by the terrible + outer sleeve in the middle of the combination. 4. Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.