Seco Niagara Cutter 17002347 Elite S938 High Performance Medium Length Multi-Flute Non-Center Cutting Single End End Mill, 5/8 in Dia Cutter, 0.008 in Corner Radius, 1-5/8 in Length of Cut, 9 Flutes, 5/8 in Dia Shank, 4 in OAL, AlTiN Coated