AccusizeTools - 5/8''4 Flute M42 8% Cobalt TiAlN Roughing End Mill, Coarse Tooth, 1102-0058 Diameter: 5/8", Shank Diameter: 5/8", Flute length: 1-5/8", Overall Length: 3-1/4" 4 Flute, Standard Tooth M42-8% Premium cobalt, TiAlN Coated Single end, centre-cutting Flutes ground by a world-class IS-9002 Factory, CNC Qualified