Seco Niagara Cutter 17004872 DIACR430 Center Cutting Medium Length Single End End Mill, 1/2 in Dia Cutter, 0.03 in Corner Radius, 1-3/8 in Length of Cut, 4 Flutes, 1/2 in Dia Shank, 4 in OAL, DiamondPlus CVD Coated