TLILY 2Pcs Woodworking Square Hole Drill Bits Wood Mortising Chisel Set Mortise Bit Kits Saw Sets

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, the construction speed, reduce construction costs For construction, installation, renovation, decoration industries. Arc design, exquisite sharpen . Colour:Silver Material:steel Size:9.5mm+16mm Package Contents: 2x Square Hole Drills Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.