Japan auger, industrial quality, 2 taper taps with special serration for tear-free drilling, precision-ground main blade. The specially ground tip produces only small shavings which are quickly removed. With black non-stick PTFE coating to reduce friction in the bore hole. Highly precise concentricity. Drill head with self-tightening thread tip for quick drilling with low effort. The thread tip is processed with high precision and penetrates the material without bulging. Drills even into the hardest wood without getting stuck. Suitable for both soft and hard wood and even for Bongossi (ironwood). HCS steel, with 11 mm hexagon shaft, for precise and effortless drilling with cordless electric drills and wired machines. Optimal for all drilling into wooden beams, glued laminated timber, and all types of wood.