Hitachi 728280 7/8-inch x 22-inch Auger Drill Bit (Discontinued by the Manufacturer) 7/8-inch by 22-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 7/8" x 22" Auger Bit 3/8" shank Precision design High speed steel Wood or Plastic