6+1 PCS: 6 PCS Countersinks are available in six different diameters of 6.3mm/8.3mm/10.4mm/12.4mm/16.5mm/20.5mm. Different diameters can be used for drilling. Sharp Anti-RustThis countersink is made of HSS high speed steel, high hardness and not easy to rust. Its cutting edge is hardened and ground, so it is sharper and has a longer service life. NoteIf you use a countersink drill on a hand drill, use a twist drill to drill the hole, and then use a countersink drill so as to avoid the risk of sloshing caused by drilling. More Processing Materials: 6 PCS walnut countersinks are suitable for chamfering the edges of holes. The countersinks can process different materials such as hardwood and cork, aluminum foil, plastic, PVC and light iron. This countersink is suitable for all kinds of machine tools. Chamfering Design: The countersink adopts the appropriate tilt angle design, anti-rust and anti-corrosion, beautiful and delicate, giving the strength and rigidity of the sharp edge cutter, the sharp increase of the cutter, the processing properties of cutting and milling. Scope of Application: This countersink drill kit is suitable for home and daily DIY use. It can be drilled easily and efficiently, not only without burrs, but also without scratches. Sharp and Durable Made of high-quality and high-quality HSS materials, this countersunk drill bit has high hardness and is not easy to rust. For example, it can be processed on steel plates, wooden boards, and plastic plates. Unique 90 Design The countersunk drill bit adopts a suitable cutting angle design, rust and corrosion resistance, exquisite chamfering, large core diameter, a balance between edge strength and sharpening resistance, increased tool rigidity, and the cutting and cutting ability of the milling cutter, making work more efficient. Multiple Sizes The countersunk drill bit has six diameters of 20.5mm, 16.5mm, 12.4mm, 10.4mm, 8.3mm, and 6.3mm. A variety of sizes to meet your drilling needs. This countersunk drill is equipped with a twist drill for positioning, allowing you to use the HSS cutter more efficiently and accurately. Packing list 6 x countersunk drill bitGood quality product