Milwaukee MX4 4-Cutter SDS plus rotary hammer-drill bits provide up to 4x life in rebar and up to 20% more holes per charge in cordless rotary hammers. The enhanced rebar guards and 4-cutter head design provide increased life and durability in hard aggregate and rebar. Additionally MX4 features a centering tip for exact spot drilling wear mark indicator indicating when the bit no longer meets ANSI diameter requirements and a reinforced flute for durability and minimized vibration. A welded tip is featured from sizes 3/16 in. to 5/16 in. the increased life and efficiency of the MX4 4-cutter drill bit line provides the ideal solution in general concrete and reinforced concrete for cordless and corded rotary hammer users.