The MILWAUKEE® 5/16" x 4" x 6" SHOCKWAVE™ Carbide Hammer Drill Bit 25 Pack uses sharpened carbide to deliver up to 5x longer life in concrete and up to 2x faster drilling into masonry material. Engineered with a precision ground tip, these bits deliver faster starts and less walking in concrete, brick, and block. The wide flute design removes dust faster, reducing heat and delivering more holes per charge. Milwaukee SHOCKWAVE™ Carbide Hammer Drill Bits have a 1/4" Hex Shank for versatility and are compatible with both impacts and hammer drills.