The Irwin Speedhammer Power Drill Bit has been designed to be able to drill through rebar reinforced concrete the use of which is increasing & rebar hits have become a common problem during construction work. The speedhammer Power drill bits have twice the carbide in the tip for extended lifetime & more durability & substains twice as many rebar hits versus the Irwin Speedhammer Plus drill bits The flute is maximized for better dust removal & extended lifetime as tungsten carbide tip i