High Quality: These square hole drill bits are made of high speed steel, through heat treatment, with high hardness drill bits and sharp square chisel, long service life. Widely Used: Excellent for drilling square holes in wood with a mortise or tenon attachment. Easy to Use: Double effect is achieved with a tenon and tenon machine. The square hole punch should be used with an electric drill, hammer or other tools. Save time: These mortise drill bits can reduce the labor intensity of construction workers, speed up the construction speed and reduce construction costs for construction, installation, renovation and decoration industries Drills precise holes with little pressure: With different specifications of square hole drill, according to the corresponding power of the square hole machine, you can make a square hole to meet the requirements Requirements: 12.7mm, 6.4mm, 9.5mm, 7.94mm < p>Due to problems such as different monitors and lighting conditions, there may be a certain color