Mills Machine Company (est. 1908) Flightless Cutter Heads feature a stronger body design and longer cutter-block life. The flightless design efficiently removes cuttings resulting in better penetration and durability. These bits are available with two- or three-key design and in any size, style or number of cutters. We also make hollow stem, solid and jet augers, bits and all related accessories that can be modified with custom options.