Seco Niagara Cutter 17004668 Elite SR420 Center Cutting Corner Chamfer High Performance Single End Stub Length Roughing End Mill, 7/16 in Dia Cutter, 9/16 in Length of Cut, 4 Flutes, 7/16 in Dia Shank, 2-1/2 in OAL, AlTiN Coated