Bosch HCFC2014B25 25-Piece 3/16 In. x 12 In. SDS-plus Bulldog Xtreme Rotary Hammer Bits 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 applications Centric conical tip results in precise hole diameters 4X life in rebar and 40% more life in concrete than competitive full head carbide bits Faster drilling speed versus 2 cutter Less Carbide Wear than 2 cutter means an end user is more productive with a single bit Solid tungsten carbide head with four cutter geometry - extraordinary lifetime and high drilling speed in concrete and concrete with rebar - No jamming 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, no overstraining.