Optimized brazing and hardening process for top resistanance in reinforced concrete</br>Optimized flute design to reduce stress and make the bit run cooler</br>4-flute design for fast dust removal</br>Centric tip for optimal hole geometry</br></br>Product Description</br></br>Value not found</br><br/>http://www.amazon.com/gp/product/B000WI4236