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✔️【WOOD SQUARE HOLE BIT SIZE】: 5/16"-3/8"-7/16"-9/16"-3/4"-7/8"
✔️【DRILLING POINT TIP】: Unique Drilling Tip with 4 Cutting Corner to Enable Fast Easy Drilling of Wood Piecesd deris of wood during application
✔️【MATERIAL】: Made of Special Steel with Heat-Treatment Keep Hardness of HRC48-51 to Ensure Longer Cutting Life.
✔️【MORTISE FEATURE】: Mortise and Tenon Square Hole Drilled by the Terrible+Outer Sleeve in the Middle of the Combiation
✔️【APPLICATION】: Mortise Chisel Bit is Great for Drilling Square Hole in Wood with Mortising Machines/Drill Press