MILWAUKEE 48-20-7931 - MX4™ 4-Cutter SDS-Plus Rotary Hammer-Drill Bit 1/4 in. x 4 in. x 6 in.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 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 20% more holes per