Bosch HC5081 Wild-Bore 1-3/8-Inch by 18-Inch by 23-Inch OAL SDS-Max Carbide-Tipped 4-Cutter Drill Bit
SDS-max WildBore Rotary Hammer Bits with Quadro-X design feature a patented extra strength tip for longer life and faster drilling. 4-cutter head provides fast, accurate drilling and true round holes for anchors. Increased flute geometry for faster dust removal and less vibration