The Milwaukee 1/4 x 2 x 4 inch SHOCKWAVE Carbide Hammer Drill Bit uses sharpened carbide to deliver up to 5X longer life in concrete and up to 2X faster drilling into masonry materials. Engineered with a precision ground tip, these bits deliver faster starts and less walking in concrete, brick and block. The carbide-tipped masonry drill bits' wide flute design removes dust faster, reducing heat and delivering more holes per charge. Equipped with a 1/4 inch Hex Shank, Milwaukee SHOCKWAVE Carbide Hammer Drill Bits are the ideal solution for drilling in masonry materials with both impacts and hammer drills/drivers.