Solid Carbide End Mill 6mm 6R1x13-20x57xD6 (Copy)D1 (Cutting diameter): 6mm D3 (Undercut diameter): 5. 8mm L2 ( Length of cut): 13mm L3 (Length of undercut): 20mm L1 (Total length): 57mm D2 (Shank diameter): 6mm Z (Number of cutting edges): 5 R Corner radius: 1. 5 Helical pitch: 40 Five cutting edges for high productivity with flexible use Unequal tooth pitch and variable helical pitch for perfect smoothness and a soft cut Radius tolerance r 1. 5 mm: 0. 003 mm Radius tolerance r > 1. 5 mm: 0. 005 mm