Up to 4-times life in rebar and 40% more life in concrete than competitive full head carbide bits</br>Faster drilling speed versus 2 cutter</br>Less carbide wear than 2 cutter means an end user is more productive with a single bit</br>No jamming when hitting rebar and optimized for heavy duty rotary hammers</br>Stress optimized flute surface and geometry</br>4X life in rebar and 40% more life in concrete than competitive full head carbide bits</br>Solid tungsten carbide head with four cutter geometry - extraordinary lifetime and high drilling speed in concrete and concrete with rebar - No jamming when hitting rebar - Optimized for heavy duty rotary hammers</br>Stress Optimized flute surface and geometry - For fast dust removal?? high power transmission?? and optimized stress behavior?? no overstraining.</br></br>Product Description</br></br>BOSCH 1/2 In. x 18 In. SDS</br><br/>http://www.amazon.com/gp/product/B001NGPAFU