Designed for longer life in concrete and reinforced concrete applications. 4 x 90 head geometry prevents locking when hitting rebar on the side. As an additional benefit, it can crush through and pulverize rebar when drilling in reinforced concrete applications. Reinforced flute geometry reduces vibrations and transfers more impact energy from the head to the tip of the drill bit. Rebar Chamfers to prevent carbide head from cracking when in contact with reinforced concrete. More mass in secondary carbide cutters for longer life.