6 sizes: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm High quality material ：HSS 4241 high speed steel with titanium coating. High hardness, good wear resistance and durability. With these high quality burrs, burrs are broken and well removed without causing scratches. Universal sized drill heads are compatible with common cordless screwdrivers and drills, including standing drills. Application: The 6-piece 90° countersinking set with 3 cutting edges is suitable for machining on metallic and non-metallic materials, such as carbon steel, sheet metal. steel, iron, aluminum, insulation, PVC, wooden panels (soft, hard), plastic, etc. Center Punch: Marks the part with a recess, creating a starting point that prevents screws and drill bits from going astray. The center punch provides an automatic, shock-resistant, spring-loaded punch by adjusting the cap. Advantages of the cutter: ❶ Batch processing: the taper cutter is a batch processing environment for the chamfering tool; ❷ The knife can grind: convenient way to protect unnecessary tool can be uninstalled en masse; ❸ material: all kinds of processing can be flexible or black metal, improve the blade, so that the service life is twice as long; ❹ The one-piece design: it makes it easier to chamfer the chips produced during the process, in the event that the ergonomics of the tool will not obstruct the delays; ❺ One-step: automatic chamfering of the hole through the two surfaces can be quickly drilled beveled edges in seconds; Excellent. Milling specification: Angle: 90 degrees Material: HSS 4241 Weight: 118 g Quantity: 6 pieces Size: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm Used for hardness 25HRC the following parts, such as carbon steel, plate thin iron, insulation board, PVC board, wood, etc. Center Punch Specification: Material: Brass Weight: 97g Quantity: 1 piece Marks the part with an indent, creating a starting point that prevents screws and drill bits from shifting Note: Due to the difference between different monitors, the picture may reflect the actual color of the item . Please consider this before purchasing. Scope of delivery: 6 HSS cutters 1 pcs brass automatic center drill punch