4Pcs Square Hole Drill Bits, High Speed Steel Mortising Chisel Drill Bit, High Hardness Woodworking Hole Saw Twist Drill Bit Set with 1/4" 5/16" 3/8" 1/2" for Wood - Bluecookie-US

• 👍【High Speed Steel Material】Our square hole drill bits are made of high speed steel material. The carbide drill bits are sharp, wear-resistant and has high hardness. It adopts U-shaped design, convenient to discharge of wood chips and improve drilling efficiency. 👍【4 Drill Sizes】The drill diameter includes 1/4inch (6.4mm), 5/16inch (8mm), 3/8inch (9.5mm), 1/2inch (12.7mm). They can be used for a long time. 👍【Widely Uses】Our square hole drill bit is suitable for wood, like MDF, particle board, channel wood, pine, basswood and more. Note: Not suitable for machining metal, glass, plastic, concrete, plasterboard, etc. 👍【Note】The square hole drill bit needs to be used in conjunction with the mortising machine. These bits cannot be used with hand drills. If you want to use these bits on a drill press, you will need accessories that attach to the drill press. 👍【100% Satisfactory After-Sales Service】If you have any questions, please feel free to contact us, our service team will provide you with professional and satisfactory service.