pMorse variFLUTE High Performance End Mill, Center Cutting Regular Length Single End Square End, Series 5991Z, 1 in Cutter Dia, 4 in Overall Length, 134 in Maximum Depth of Cut, 2 Flutes, Variable Flute, 1 in Shank Dia, Right Hand Cutting, PlainRound Shank, Carbide, ZrN Coatedp.