1,High quality coating 2,Low prices and high quality 3,High strength and packing 4,HRA90 1,Material:WF-25,90% tungsten and 10% Cobalt2,With high quality coating:TIALN3,With 5um concentricity and 3800Nm fracfure forces;the hardness of HRA90, and advice cutting under 50degrees steel GDK 3-100 Solid Carbide end mill