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. As proof of quality, the drill bit bears the test mark of the PGM Masonry Drill Bit Association Board, guaranteeing compliance with tight tolerances, exact drilling and the firm hold of fixings. The bit is intended for work on concrete and masonry and is to be used with rotary hammers with SDS plus holders. High Alloy Steel SDS Plus Shank 5.5mm-10mm Dia. Drill Bits Suitable for Concrete & Masonry Tungsten Carbide Tip For Use with SDS Plus Rotary Hammers 4-Flute Design for Stability High Alloy Steel SDS Plus Shank 5.5mm-10mm Dia. Drill Bits Suitable for Concrete & Masonry Tungsten Carbide Tip For Use with SDS Plus Rotary Hammers 4-Flute Design for Stability