Seco Niagara Cutter 17006999 Elite S545R Center Cutting High Performance Medium Length Single End End Mill, 5/16 in Dia Cutter, 0.015 in Corner Radius, 13/16 in Length of Cut, 5 Flutes, 5/16 in Dia Shank, 2-1/2 in OAL, AlTiN Coated