Seco Niagara Cutter 02941940 NS240R Center Cutting High Performance Single End Stub Length End Mill, 5/16 in Dia Cutter, 0.01 in Corner Radius, 1-1/2 in Length of Cut, 2 Flutes, 5/16 in Dia Shank, 3-1/2 in OAL, AlTiN Coated