Feature: 1. Wide Application: Ideal for cutting through metal, wood, plastic and thin iron plate (hardness <25 degrees). 2. 4PCS Countersink Drill Bit: 4pcs countersink drill bits chamfer range are 2‑5mm, 5‑10mm, 10‑15mm, 15‑20mm. 3. 90 Degree Angle: 90 degree angle on the point for incisive and precise countersinking, used for workpiece circular aperture chamfering or cone hole. 4. Usage Scenarios: Fit for DIY, home and general construction, the chamfer cutter can also be adaptive to engineering purposes. 5. High Quality Materials: Made of high quality high speed steel, rust proof, strong and durable, and not easy to damage. Specification: Item Type: Countersink Drill Bit Material: High Speed Steel Color: As shown in the picture 2-5: Chamfer Range: Approx.2-5mm / 0.08-0.20in Shank Diameter: Approx.6mm / 0.24in Head Diameter: Approx.9.7mm / 0.38in 5-10: Chamfer Range: Approx.5-10mm / 0.20-0.39in Shank Diameter: Approx.8mm / 0.31in Head Diameter: Approx.14mm / 0.55in 10-15: Chamfer Range: Approx.10-15mm / 0.39-0.59in Shank Diameter: Approx.10mm / 0.39in Head Diameter: Approx.21mm / 0.83in 15-20: 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, PV panels . Package List: 4 x Countersink Drill Bit Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.