1PCS 4 or 2 flutes 20x150MM Tungsten Carbide End Mill / ball end End Mill HRC45 HRC50 HRC55 HRC60 HRC65 Aluminum milling cutter r0 2x0 4x4x4x50l 10pcs deep neck groove carbide ball nose end mill 2 flutes hrc55 with coating cnc milling cutter free shipping