UM series High Speed Cutter (HSC) For roughing and finishing of steel up to 55 HRC, stainless steel and cast iron with high metal removal rate. Optimised geometry with unequal helix angle (38°/41°) and unequal pitch. End mills and torus mills Diameter range 4.0–20.0 mm UM-4RFP UM-4EFP UM-4E UM-4R UM-4RFP UM-4E B 415