Bosch HCFC2064B25. . Features: 4X more life in rebar and 40% more life in concrete than competitive full head carbide bits. Faster drillng speed compared to 2-cutters. Less carbide wear than 2-cutters means that the user is more productive with a single bit. Solid tungsten carbide head with 4-cutter geometry has extraordinary lifetime and high drilling speed in concrete and concrete with rebar. No jams when hitting rebar. Optimized for heavy-duty rotary hammers. Stress optimized flute surface and geometry for fast dust removal, high power transmission, and optimized stress behavior with no overstraining. New centric conical tip for top hole guidance and constant hole diameter. New sharp cutting edge border for deep penetration into concrete with rebars with each hit and continuous high drill speed.