Corner Radius End Mill: 5/16" Dia, 13/16" LOC, 0.5 mm Radius, 3 Flutes, Solid Carbide 2-1/2" OAL, 5/16" Shank Dia, 45 ° Helix, Uncoated, Single End, Centercutting, Series End Mills for Aluminum - 3 Flute - Corner Radius - 450 Helix - Chipbreaker Rougher