pvariFLUTE Single End Mill, Center Cutting Regular Length, Series 5998, 18 in Cutter Dia, 112 in Overall Length, 316 in Maximum Depth of Cut, 7 Flutes, Variable Helix Flute, 18 in Shank Dia, 45 deg Helix Angle, 10 Cobalt Micrograin Solid Carbide, nACo Coatedp.