From the manufacturer Bosch Professional SDS Plus-3 Hammer Drill Bit The SDS plus-3 Drill Bit offers durability when drilling in concrete. To prevent heat development, the 4-flute dura design provides effective dust removal for increased endurance. It is made of high-alloy steel, which is produced with an optimised hardening technology to withstand wear. For additional resistance, indented cutting edges are made from an ideal Bosch-controlled carbide blend. The bit is intended for work on concrete and masonry and is to be used with rotary hammers with SDS plus holders.