The DEWALT 5/8" x 10" x 12" Rock Carbide SDS+ Hammer Bit (DW5447) delivers the best in durability and long life, so you can work confidently without worrying about the tool. With four cutter heads and two times more carbide than competitive two cutter bits, this bit is tough across multiple drilling operations, even in reinforced concrete. An innovative bonding system attaches the tip to the flute and ensures that the bit will last.