– M725/M726 Omega The Omega-6 is a purpose-driven end mill for machining in hard metal applications. Available in both the second (M725/726) and first (M706) generations. Engineered with strong cutting edges and a thick core for long tool life when machining steels up to 62 HRC. Heat-resistant coating yields great tool performance in both wet and dry machining conditions. An excellent tool for finishing applications in a wide range of materials.