Solid Carbide End Mill 20mm 20R0.3x41-54x104xD20D1 (Cutting diameter): 20mm D3 (Undercut diameter): 19. 5mm L2 ( Length of cut): 41m L3 (Length of undercut): 54mm L1 (Total length): 104mm D2 (Shank diameter) 20mm Z (Number of cutting edges): 4 Corner radius: 0. 3 Helical pitch: 40 Unequal tooth pitch combined with variable helical pitch for smooth running Reinforced cutting edge with corner protection radius Enlarged chip chambers for flushing with cooling lubricant Unleashes its full performance