＊Long Neck end mills specialized for processing copper alloy. ＊Helix Angle 37.5 degrees to achieve both sharpness and finished surface quality that prevents scratches on cutting surface. ＊High quality and stable milling performance with long tool life by optimized design and DLC coating. ＊Processing copper tungsten electrodes is also effective. ＊It can also achieve a long processing life when processing copper and tungsten.