DEWALT SDS+ Hammer Bit, Rock Carbide, 3/4-Inch by 10-Inch by 12-Inch (DW5455), Silver - Strong core: SDS max bits have tapered core for bit strength and maximum durability, especially when drilling deep holes - Aggressive material removal: Two stage flute design with variable helix pattern of DEWALT SDS hammer drill bits allows for efficient debris removal - Clean, round holes: Two sharp cutting edges for true holes - Wear mark indicator: For accurate diameter of holes - NO BREAK GUARANTEE: If your bit fails for any reason while the wear mark is still visible, well replace it (excludes: DW5400, DW5401, DW5401B25)