Features: The unique limit rings design paired with bearing allows for flexible rotation, preventing scratches on the surfaces of the wooden board and ensuring safe operation every time. Integrate the functions of countersunk and reaming drills to meet various drilling needs, improve work efficiency, and simplify tool selection. The blade is crafted from hard alloy, wear-resistant, and has smooth and smooth openings, which can maintain excellent drilling performances even in harder wood. The 6.25mm round handle design is suitable for various power tool, ensuring stable fixation and improving drilling accuracy and control. Five specifications of 2.8/3.0/3.2/3.5/4.0 are available for use, suitable for various types of wood. Specifications: Material: Alloy Package Includes: 6Pcs Countersink Drill Bit note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.