Check the listing for details. Square Hole Drill Bits Saw Wood Mortising Mortise Chisel Set Woodworking Tools. Color: Silver, Condition: New. Listed at 9.35 USD. square hole saw Description: ​ ​This is great for drilling square holes in wood with a mortising machine Specification ​ ​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 durable. ​ ​Use matters: Square hole drill is mainly used for woodworking aspects. ​ ​ ​ ​Features: ​ ​ ​Name: Square Hole Saw ​ ​Material: Spring steel ​ ​Color: as picture shows ​ ​Product size: 6mm(15/64''), 6.4mm(1/4''), 8mm(5/16''), 9.5mm(3/8''), 10mm(2/5''), 11mm(7/16''), 12mm(15/32''), 12.5mm(31/64''), 12.7mm(1/2''), 14mm(9/16''), 15mm(19/32''), 16mm(5/8''), 18mm(23/32''), 19mm(3/4''), 20mm(25/32''), 22mm(7/8''), 25mm(1'')