Solid Carbide End Mill 8mm 8R0.2x24-30x70xD8D1 (Cutting diameter): 8mm D3 (Undercut diameter): 7. 8 mm L2 ( Length of cut): 24mm L3 (Length of undercut): 30mm L1 (Total length): 70mm D2 (Shank diameter): 8mm Z (Number of cutting edges): 7 Corner radius: 0. 2 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