BRAND NEW GEUNINE Stihl 7/8" (0.875") diameter x 18" long wood boring drill bit in the case, part number: 4314 682 5003 (43146825003).  This item is new in the package, and designed to be used with the following gas-operated drill model: BT45 (or other power drills with 1/2" chuck).  Please see your dealer for specific fitment questions, and to verify that this is indeed the p/n you're looking for.