Hitachi 728252 1-inch x 12-inch Auger Drill Bit (Discontinued by the Manufacturer) 1-inch by 12-inch auger drill bit with 3/8-inch shank diameter Precision design creates less wobble in the drill and bit Self-feeding tip and wide throat leave cleaner holes Ideal for wood, plastic and metal Comes with a 30-day limited warranty 1" x 12" Auger Bit 3/8" shank Precision design High speed steel Wood or Plastic