Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.
Helps you create your square holes effortlessly and perfectly. It helps to prevent frustration and saves your time as you complete your tasks.
Drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use
Material: High-Speed Steel
Clamping shank diameter: 1/4 INCH (6.4MM) 5/16 INCH (8MM) 3/8 INCH (9.5MM) 1/2 INCH (12.7MM)
Middle terrible diameter: Total length: 19.5 cm / 7.68 in; Diameter: 6.8 mm / 0.27 in
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