Features 1、Versatile Drill Sizes: This set includes five countersink bits with diameters of 2.8mm, 3.2mm, 3.5mm, and 4.0mm, catering to a wide range of drilling needs. Whether you are working on different materials or require various hole sizes, this set provides the versatility needed for any project. 2、4 Flute Design: The counter sinker drill bits feature a 4 flute cutting design with guiding flutes that ensure faster and more efficient cutting. Made from tungsten carbide alloy, the incisive edges create slick countersink holes that facilitate accurate screw installation, resulting in clean and professional finishes. 3、Robust Construction: Crafted from excellent aluminum alloy, our countersink wood drill bits are exceptionally resistant to bending and wear. This strong construction guarantees long lasting performance, making them good tools for both professional and handcraft users. 4、Efficient Chip Removal: The design of the countersink drill bits effectively removes debris during drilling, allowing for quick expulsion of chips from the hole. This enhances drilling efficiency and reduces build up, making it easier to achieve clean and accurate results. 5、Adjustable Depth Stop: The countersink bits come equipped with an adjustable depth stop feature, enabling users to set the drilling depth according to specific requirements for countersinking and drilling tasks. Additionally, the set includes a storage box for four countersink bits, an extra frictionless depth control ring, and an hex wrench, ensuring easy transport and organization for your tools, keeping everything neatly stored and ready for use. Specification Item Type: Countersink Drill Bit Set Material: Aluminum Alloy Body, 6542 Blade Shank Size: Approx. 6.25mm / 0.25in Drill Bit Size: Approx. 2.8mm / 0.11in, 3.2mm / 0.13in, 3.5mm / 0.14in, 4mm / 0.16in Cutting Blade Diameter: Approx. 10mm / 0.39in Countersink Angle: 90° Application: Hand Drills, Charging Piles, Bench Drills, etc. Applicable Materials: Suitable for deep holes in hard wood, used for drilling screw holes in wood and sinking screw heads. Package List 4 x Countersink Drill Bits (2.8mm, 3.2mm, 3.5mm, 4.0mm) 1 x Hex Wrench 1 x Plastic Box