The US PRO 6pc HSS Countersink Set is designed for precision countersinking and deburring, making it ideal for a variety of applications. With its high-speed steel construction, this set ensures smooth, burr-free finishes on multiple materials. Key Features: Application: Ideal for producing precision countersink holes and deburring Material Compatibility: Suitable for metal, synthetic materials, wood, and more Smooth Finish: Cutting features ensure a clean surface without burrs Convenient Storage: Supplied in a metal case Drill Compatibility: For use with corded or cordless drills Specification: Sizes: 6.3mm, 8.3mm, 10.4mm, 16.5mm, 20.5mm Material: HSS 4241