7-piece CYL-5 Robust Line drill bit set for drilling in concrete. CYL-5 drill bits, extra durable for concrete and stone. Guaranteed maximum stability for dowel drilling. The Bosch proprietary carbide blend and diamond-ground cutting edges make the drill bit wear-resistant. Reduced friction is achieved through the 2-spiral Vario design, which ensures efficient drill dust transport and reduced wear. The Bosch Power-Grip shank system allows for direct power transfer. Diameters: 4 / 5 / 5 / 6 / 6 / 8 / 10 mm, working lengths: 5 / 5 / 5 / 5 / 5 / 5 / 10 cm. The CYL-5 drill bit guarantees maximum lifespan when drilling into concrete and stone. The combination of Bosch's proprietary carbide blend and diamond-ground cutting edges makes the drill bit extremely wear-resistant. Friction on the spiral from the drilling material is significantly reduced thanks to a 2-spiral Vario design with a short, variable incline. The Bosch Power-Grip shank system ensures 100% power transfer from the machine to the drill bit. This way, power can be transferred directly to the drilling process without loss and with less wear. Suitable for dowel drilling in concrete, natural stone, and artificial stone. The drill bit carries the quality test mark from the PGM Masonry Drill Bit Association Board, which guarantees compliance with strict tolerances, precise drill holes, and a secure hold of the fastening material. It is compatible with cylindrical shank systems for corded or cordless hammer drills.