Solid Carbide End Mill 20mm 20R2x38-54x104xD20D1 (Cutting diameter): 20mm D3 (Undercut diameter): 19. 5mm L2 ( Length of cut): 38mm L3 (Length of undercut): 54mm L1 (Total length): 104mm D2 (Shank diameter): 20mm Z (Number of cutting edges): 4 R Corner radius: 2 Helical pitch: 40 Unequal tooth pitch combined with variable helical pitch for smooth running Highly polished chip space for safe chip evacuation Reinforced face for process reliable, helical diving Radius tolerance r 1. 5 mm: 0. 003 mm