Milwaukee® MX4™ 4-Cutter SDS-Plus Rotary Hammer Drill Bits provide up to 4x Life in Rebar and up to 20PERC more holes per charge in cordless rotary hammers. The enhanced rebar guards and 4-Cutter 90? head design provide increased life and durability in hard aggregate and rebar. Breaker Point pulverize the material more effectively resulting in faster drilling speeds. The variable flute allows for maximum debris extraction leading to up 20PERC more holes per charge in cordless rotary hammers while making it a very durable bit in corded and cordless rotary hammers. 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. 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. Bullets: 4-Cutter 90? Head Design reduces lock up in rebar and provides up to 4x life in rebar Enhanced Rebar Guards provide increased durability Breaker Points lead to faster drilling speeds Variable Flute for Up to 20PERC more Holes per Charge in Cordless Rotary Hammers Centering Tip for exact spot drilling Wear Mark Indicators to show end of life and when bit no longer meets the ANSI requirement Reinforced Flutes for minimized vibration and maximum durability.