Solid Carbide End Mill 12mm 12R0.5x12-75x119xD12D1 (Cutting diameter): 12mm D3 (Undercut diameter): 11 mm L2 ( Length of cut): 12mm L3 (Length of undercut): 75mm L1 (Total length): 119mm D2 (Shank diameter): 12mm Z (Number of cutting edges): 4 R Corner radius: 0. 5 Helical pitch: 30 Unequal tooth pitch and variable helical pitch for smooth running Specially designed cutting edge geometry for contour machining Optimized chip chambers for safe evacuation of the chips Radius tolerance r 1. 5 mm: 0.