Seco Niagara Cutter N44918 RFCB444 Center Cutting Medium Length Single End End Mill, 1/2 in Dia Cutter, 0.025 in Corner Radius, 1-1/4 in Length of Cut, 4 Flutes, 1/2 in Dia Shank, 3-1/4 in OAL, Uncoated