Speed Augers with a four fluted cutter, designed for rapid chip ejection and cleaner hole drilling into timber. Four flute cutter design High grade carbon steel Screw point Hex shank with 1/4" quick release" Drill Dia. mm: 16.0 Total Length mm: 159 Working Length mm: 80 Shank Dia. mm: 6.35 Shank Type: Hex Drill Tip: Screw Material: Carbon Steel Timco Hex Shank Speed Auger Bit (Size 16.0 x 159 - 1 Each) in Red