Micro 100 BLRM-020-4X 30° Helix Reduced Neck Ball Nose End Mill, 4 Flute, AlTiN Coated, Solid Carbide Tool, Metric Dimensions, 2 mm Cutter Diameter, 6 mm Shank Diameter, 57 mm Overall Length, 5 mm Flute Length, 1.5 mm Reduced Neck Diameter, 15 mm Reduced Neck Length