Description 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 mortiser or mortise attachment.Easy to Use: It will do double duty using a mortise and tenon machine. The square hole punch should be used with electric drill, hammer or other tools.Save Time: These mortise bits can reduce the labor intensity of construction workers, speed up construction speed, reduce construction costs for construction, installation, renovation and decoration industry Drills precise holes with little pressure: using different specifications of the square hole drill, corresponding to the appropriate power of the square hole machine, you can play a square hole to meet the requirements: 12.7mm, 6.4mm, 9.5mm, 7.94mm Due to issues such as different monitors and light, there may be some color difference in color, please refer to the actual product, please understand Quantity delivered: 4 pieces