Solid Carbide End Mill 12mm 12R1x42-50x93xD12D1 (Cutting diameter): 11mm D3 (Undercut diameter): 11. 4mm L2 ( Length of cut): 42mm L3 (Length of undercut): 50mm L1 (Total length): 93mm D2 (Shank diameter): 12mm Z (Number of cutting edges): 5 R Corner radius: 1mm Helical pitch: 39 Special aerospace geometry optimized for vibration free milling and ideal chip removal for thin walled workpieces and complex internal machining Radius tolerance r 1. 5 mm: 0. 003 mm Radius tolerance r > 1. 5 mm: 0. 005