Perfect solution for reinforcing bars and hard materials; Symmetrical, one-piece insert with four cutting edges and a four-spiral Vario feed auger with core reinforcement. Significantly improved compatibility with rebars The symmetrical 4 x 90° cutting edge geometry (up to Ø 10 mm with hard carbide head) prevents the drill bit from curving inwards or becoming off-centre, for example when drilling reinforcing bars. Noticeably faster drilling Advanced tip geometry and asymmetrically placed elevations on the cutting edges provide improved traction. Excellent drilling properties throughout the entire lifetime. Excellent drilling action thanks to the tip geometry adapted to the drill bit diameter; 5–16 mm: One-piece diamond tip: Maximum connection surface with steel body ensures high stability. ; 18–32 mm: Multi-piece diamond tip for faster drilling and three-section design to improve torsional force limitation. ; Significantly improved drilling speed and dust removal as well as greater protection against breakage. The Vario spiral conveyor with its rear section narrowing at the front and widening at the rear, as well as the sharpening angle at the spiral end, ensures less friction, a high level of stability and maximum transmission of impact energy. Ideal feed through the drill hole Drill bit with four cutting edges and four spiral geometry to ensure perfect guidance of the drill bit into the hole. Precise spot drilling The special self-centering tip ensures high precision in spot drilling. Note Reinforcement bars may only be drilled with permission from a structural engineer. For longer drill bit lengths, pre-drill with a short drill bit of the same diameter.