Immediate centring tip prevents skidding on smooth surfaces.Size range 5 mm to 32 mm.Optimised 4 x 90° symmetry makes all 4 carbide cutting edges work evenly and at the same time.To withstand wear the drills are made of high-alloy steel produced with optimised hardening temperature.For masonry, reinforced concrete, natural stone, artificial stone.Specially designed head geometry for better centre drilling, faster drilling progress, precise drilling hole.Fits directly into all hammer drilling machines with SDS-plus and HILTI TE-C drive