Blacksmith Masonry Drill Bit Set (4,5,6,8mm)This Blacksmith Masonry Drill Bit Set provides the novice or professional an easy and effective way to drill concrete, stone, brick and other masonry surfaces. The set includes four high quality drill bits (4, 5, 6, and 8mm) with a special carbide cutting tip for precision and increased longevity. Enjoy improved accuracy with its fusion welded construction and maximum durability.