Compatibles with electric hammer, hand drills, and electric drills, the 8mm shank ensures easy clamping and quick tool changes, enhancing your workflow seamlessly precisions and efficiency with our Adjustable Tapered Countersink Drill Bit, crafted from hard alloy steel for high hardness and wear resistance, ensuring sharpness and longevity in every use Featuring a adjustable positioner with a ranges of 2.5-10.5mm, this drill bit is designed for precise processing, equipped with twist chip flute design to chip accumulation and enhances work efficiency Perfect for various woodworking projects, including installations on wood, particle board, and decorative panels, making it a multifunction tool in any workshop or home setting Ideal for both professional craftsmen and craft enthusiasts, this countersink drill bit caters to anyone seeking great and accurate woodwork result, Manufacturer: Oxxggkao