Milwaukee's M/2 2-Cutter SDS-Plus Rotary Hammer-Drill Bit 1/4" x 4" x 6" (48-20-7531) is a durable 2-cutter bit with up to 20% more holes per charge in cordless rotary hammers. The enhanced rebar guards provide increased 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 charge in cordless rotary hammer while making it a very durable bit in corded and cordless rotary hammers.