EPBT2030 Advanced TH Coating, Nano-PVD Technology, 2 Flute High Speed, Roughing, Semi-Finishing, Finishing R: 1.5 Diameter: 3mm Length: 70mm Coolant Delivery: External With a hardness of 3800Hv and oxidation temperature of 1200°, our new ATH Coating enables longer life and higher efficiency when cutting high-hardness materials (55HRC or higher). Compared with our previous generation coating, double the tool life and more than double the machining efficiency can be achieved. The ATH Coating is ideal for both dry cutting and wet cutting in a variety of materials including cold-worked die steel, HSS, tool steel, composite materials, carbide alloys and more.