4PCS HSS Twist Drill Bits Electric Square Auger 6.4/8/9.5/12.7mm Mortising Chisel Drill Square Hole Woodworking Drill Tools Kit

• This Mortising Chisel is great for drilling square holes in wood with a mortising machine Specification
• Name: Square Hole Saw
• Material: High-speed steel
• 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.

• Product size: 1/4inch(6.4mm), 5/16inch(8mm), 3/8inch(9.5mm), 1/2inch(12.7mm)
• Weight:
• 1/4inch(6.4mm)--122g
• 5/16inch(8mm)--138g
• 3/8inch(9.5mm)--153g
• 1/2inch(12.7mm)--217g