Micro 100 BLR-375-4 30&deg; Helix Reduced Neck Ball Nose End Mill, 4 Flute, Solid Carbide Tool, 3/8" Cutter Diameter, 3/8" Shank Diameter, 4" Overall Length, 3/4" Flute Length, 0.355" Reduced Neck Diameter, 2-3/4" Reduced Neck Length