MX4 4-Cutter SDSPLUS Rotary Hammer Drill Bits with solid head carbide deliver...MX4 4-Cutter SDS PLUS Rotary Hammer Drill Bits with solid head carbide deliver up to 5x longer life in concrete with rebar. Engineered with rebar guards to provide maximum durability in hard aggregate and rebar. We designed MX4 4-Cutter bits with...more