M42 Cobalt 2 Flute Extended Neck End Mills Center Cutting 35° LH Spiral . Series 26A Square End Extended Neck ... 3 4 Flute High Helix Profile End Mills Ball Nose 60° RH Spiral ASP % POWDERED COBALT. Uncoated ... Ball End 3, 4 or more Flutes RH 30° Spiral. Uncoated Series RKQCMAll .