GM series For general applications For machining of steel to max. 50 HRC and cast iron to heat-resistant alloys. Sharp cutting edge with high edge stability. Roughing to finishing with long tool life. End mills, ball nose cutters, torus mills, rippers and mini cutters. Diameter range 0.3–20.0 mm Application fields for machining of steel HM PM GM 30 HRC 40 HRC 50 HRC 55 HRC 68 HRC very suitable suitable GM-4B GM-2B GM-4E GM-6E GM-2E GM-4W GM-4R GM-2R B 271