Hitachi 728228 7/16-inch x 8-inch Auger Drill Bit 7/16-inch by 8-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 7/16" x 8" Auger Bit 3/8" shank Precision design High speed steel Wood or Plastic