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Bosch Bulldog Xtreme 3/8" x 4" x 6" SDS-Plus Carbide Rotary Hammer Drill Bit. It has a 4X longer life in rebar and 40% more life in concrete than competitive full head carbide bits. It is optimized for heavy duty rotary hammers and has less carbide wear than 2 cutter means end user is more productive with each bit. No jamming when hitting rebar. Diffusion bonding technology provides stronger carbide bond for a longer lasting bit. Wear mark assures accuracy of hole diameter. Centric conical tip guides bit through concrete and provides rounder holes.