Three Point Design: Quickly and precisely drill a smooth hole. Better centering and no slipping. The five-edge chamfer design will quickly discharge chips from the hole on both sides. It can effectively prevent debris retention accumulation, improve drilling efficiency. Very suitable for use in drilling wood holes of various sizes. One tool for multiple uses, improve your work efficiency. High-speed heat-treated steel: Taper drill bits are made of high-speed steel, treated by quenching, so they are of high hardness, wear-resistant and durable. Removable and Adjustable: This cone drill bit set contains 6 hex wrenches, use the hex wrench to adjust the counter sleeve depth and drilling depth for different length screws. A complete specification can meet all your requirements. Applicable: Drill with chuck or joints, each drill bit comes with a plastic box with marked size for easy identification and storage. The 6 Piece Countersunk Bit Set is the perfect addition to any woodworker's toolbox. Features : High speed heat treated steel. Suitable for all types of wood drilling operations. Unique twist design for smooth drilling. Compatible with chuck drills, for drilling wood or parquet. Tip dimensions: 2.8*8+2.8*10+3*8+3*10+3.2*8 +3.2*10 mm Color: orange + silver