Solid Carbide End Mill 20mm 20R0.3x60-70x125xD20D1 (Cutting diameter): 20mm D3 (Undercut diameter): 19. 8 mm L2 ( Length of cut): 60mm L3 (Length of undercut): 70mm L1 (Total length): 125mm D2 (Shank diameter): 20mm Z (Number of cutting edges): 7 Corner radius: 0. 3 Helical pitch: 40 Variable helical pitch with unequal tooth pitch for smooth running and a soft cut Adapted chip chambers for trochoidal milling Optimized design of the chip breakers for maximum tool life 7 cutting edges for best