48-20-8402 - DRILL BIT SDS MAX 1/2X13IN MX4 4 CUTTER CONCRETE CARBIDE HAMMERThe Milwaukee SDSMAX 4Cutter MX4 1 2 X 71 2 X 13 Rotary Carbide Drill Bit. Drill Bits feature solid carbide heads that deliver up to 5x longer life in concrete with rebar. Engineered with rebar guards to provide maximum durability in hard aggregate and rebar. MX4 4Cutter bits are designed with sharp centering tips for exact spot drilling in concrete. The integrated 4cutter design prevents lockup in rebar reducing downtime. Variable flutes remove dust