There were problems drilling the right size hole for the cow's calls. REQUIRED 41/64 bit. I measured this bit and found it's only 39/64. Cost me some pieces of exotic, expensive wood. Apparently close to Bosch, but not to me! I spent good money on it and it ended up costing me money and time. I wouldn't have thought to put the microphone on the beat when I bought it. Buyers beware the mic with your Bosch bits