ISO 1641 and DIN 844 L B. C273 HSCo long length end mill in 2 sizes for finishing work. A range of long cobalt end mills (steel quality HSCo 8% Co) with a cylindrical shank and flat face. The shank diameter tolerance class is H6 and the cutting diameter is K10. Helix geometry is 30° right-handed and the cutting angle is 12°. Specially designed for finishing work.