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Bosch 1" x 8" x 10" SDS Plus Carbide Rotary Hammer Drill Bit is designed for heavy duty rotary hammers. It has a 4X longer life in rebar and 40% more life in concrete than competitive full head carbide bits. The optimized design reduces carbide wear and jamming when hitting rebar. The diffusion bonding technology provides a stronger carbide bond for a longer lasting bit. The wear mark assures accuracy of hole diameter and the centric conical tip guides the bit through concrete and provides rounder holes.