Features: Wide Application: Ideal for cutting through metal, wood, plastic, and thin iron plate with hardness below 25 degrees. Versatile Set: Includes 4 countersink drill bits with chamfer ranges of 2-5mm, 5-10mm, 10-15mm, and 15-20mm. Precise 90 Degree Angle: 90 degree point angle for accurate and clean countersinking, suitable for circular aperture chamfering or cone hole applications. Multiple Usage Scenarios: Suitable for DIY projects, home use, general construction, and engineering applications. High Quality Materials: Made of high-speed steel, offering durability, rust resistance, and long-lasting performance. Specification: Item Type: Countersink Drill Bit Material: High Speed Steel Color: As shown in picture 2-5mm Bit: Chamfer Range: Approx. 2-5mm / 0.08-0.20in Shank Diameter: Approx. 6mm / 0.24in Head Diameter: Approx. 9.7mm / 0.38in 5-10mm Bit: Chamfer Range: Approx. 5-10mm / 0.20-0.39in Shank Diameter: Approx. 8mm / 0.31in Head Diameter: Approx. 14mm / 0.55in 10-15mm Bit: Chamfer Range: Approx. 10-15mm / 0.39-0.59in Shank Diameter: Approx. 10mm / 0.39in Head Diameter: Approx. 21mm / 0.83in 15-20mm Bit: Chamfer Range: Approx. 15-20mm / 0.59-0.79in Shank Diameter: Approx. 12mm / 0.47in Head Diameter: Approx. 28mm / 1.10in Weight: Approx. 183g / 6.5oz Application: Workpieces with hardness below 28, such as aluminum parts, iron plates, plastics, and PV panels Package List: 4 x Countersink Drill Bit