<p>Total 5 pieces: This countersunk drill bit set contains 5 drill bits of different sizes (2.8/3/3.2/3.5/4 mm).</p> <p>Removable and Adjustable: Use the included hex wrench to remove the screws and adjust the length of the countersunk hole to adjust the drilling length of screws of different lengths to improve work efficiency. Very suitable for DIY, home and small woodworking projects to meet different woodworking needs.</p> <p>Durable: The drill bit is made of high-speed steel and tungsten steel, and the drill body is made of 45# steel substrate. Sturdy and durable. The sharp tungsten steel blade enables fast drilling and smoother cutting. It is sharp and wear-resistant without burrs.</p> <p>Applicable materials: Hardwood and plywood, the drilling is clean and neat, and it can maintain good drilling results even on materials such as compressed board, plastic, medium-density fiberboard, pine and beech. The drill bit is extremely sharp, ensuring long-term durability and reliable performance.</p> <p>Applicable Models: 8mm round shank countersunk drill bit set, can be firmly fixed on the drill chuck. Suitable for most models, including lithium electric drills, hand drills, bench drills, etc.</p>