Solid Carbide End Mill 6mm 6R0.15x18-25x63xD6D1 (Cutting diameter): 6mm D3 (Undercut diameter): 5. 8 mm L2 ( Length of cut): 18mm L3 (Length of undercut): 25 mm L1 (Total length): 63mm D2 (Shank diameter): 6mm Z (Number of cutting edges): 7 Corner radius: 0. 15 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