BOZONLI 1/4(6mm) Square Hole Drill Bit, Woodworking Mortising Chisel Wood Saw Mortice Cutter Bit Twist DIY Opening Drilling Tools

【Alloy drill bIt】The drill bit is forged with alloy steel, the overall heat treatment, high hardness, long life 【Material】Made of bearing steel. Heat treatment, high hardness, lengthened core, high concentricity; 【Chip flute】U-long chip flute design to facilitate the discharge of wood chips and improve drilling efficiency. 【Universal shank】The drill tail adopts a circular design, which makes the clamping more stable. It is suitable for square hole drills and square tenon machines. 【Application】Square hole drill is mainly used for wood board, MDF, particle board, density board, woodworking aspects.