Seco Niagara Cutter 03115936 Elite S638R Center Cutting High Performance Medium Length Multi-Flute Single End End Mill, 1/4 in Dia Cutter, 0.03 in Corner Radius, 5/8 in Length of Cut, 6 Flutes, 1/4 in Dia Shank, 2 in OAL, AlTiN Coated