DeWalt 1" x 31" x 36" High Impact Drill Bit SDS-Max 4 Cutter DW5820DEWALT 1 X 24 X 29IN SDS MAX BIT DW5852 SDS Max High Impact Carbide 4 Cutter Drill Bits are manufactured with IRON BLAST TECHNOLOGY, a process that strengthens the bit to resist fatigue and results in extreme durability. The redesigned, 4 cutter carbide head offers 2X longer life* and even stands up to rebar strikes. High impact tip maximizes carbide surface contact for longer bit life. Open head design channels dust into flutes for quicker drilling.