Bosch HCFC2044 SDS-plus Bulldog Xtreme Rotary Hammer Bit, 1/4"x12"4X life in rebar and 40% more life in concrete than competitive full head carbide bits. Optimized for heavy duty roatary hammers. Less carbide wear than two cutter means end user is more productive with each bit. No jamming when hitting rebar. Highlights: Diffusion bonding technology provides stronger carbide bond for the longest lasting bit 4X life in all concrete types and concrete with rebar Wear mark assures hole diameter tolerance for anchoring