Features Clean Production: Create perfect countersunk holes for flat head screws and plug head screws without splitting wood, ensuring clean engineering with this drill bit set. Adjustable: Easily adjust for screws of different lengths and create consistent depth countersunk holes on wood, protecting the working surface and preventing debris cavities. Wide Use: Suitable for wood, medium density fiberboard, particle board, and dense plywood, enhancing versatility for various woodworking tasks. Cemented Carbide Material: Made of cemented carbide with HRC 50 to 54 hardness, offering excellent cutting ability, durability, and wear resistance for long-term use. 4PCS: Includes 4 pieces countersunk drill bits in the package, offering different sizes to cater to various woodworking needs. Specification: Item Type: Countersunk Drill Bit Material: Cemented Carbide Specification: 1/4 x 2.5; 1/4 x 2.8; 1/4 x 3.3; D1/2 x 3.5 Package List: Item Type: Countersunk Drill Bit Material: Cemented Carbide Specification: 1/4 x 2.5; 1/4 x 2.8; 1/4 x 3.3; D1/2 x 3.5 Package List 4 x Countersunk Drill Bit 4 x Hex Wrench 4 x Screw 4 x Storage Cartridge