The MILWAUKEE MX4 4-Cutter SDS PLUS 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. The Milwaukee MX4 4-Cutter bits are designed with sharp centering tips for exact spot drilling in concrete and metal decking. The 4-cutter design prevents lock-up in rebar, reducing downtime. Variable flutes remove dust faster, reducing heat and delivering up to 20% more holes per battery charge. The wear mark indicator on each drill bit shows you when the bit no longer meets the ANSI requirement. The MX4 4-Cutter Drill Bits are ideal for concrete with rebar and masonry applications. This kit includes (1) 5/32, (2) 3/16, (2) 1/4, (1) 5/16, (1) 3/8, (1) 1/2 MX4 4-Cutter SDS PLUS Rotary Hammer Drill Bits. Packaged in a medium, double-sided hard case designed for use in MILWAUKEE PACKOUT Storage System.