Fast Spiral Rotary Masonry bit – designed for drilling in masonry, block and brick with a rotary drill, providing fast drilling and long life Single-flute design – provides fast material removal Carbide head – delivers long life in masonry applications Precision manufacturing – designed to help eliminate bit walking High-speed mode – delivers performance in cordless high-speed mode Masonry applications – engineered for masonry, block and brick Rotary drilling – designed for rotary drilling; not for hammer drilling 14 piece set with plastic case contains: (3) 1/8", (2) 5/32", (3) 3/16", (3) 1/4", (1) 5/16", (1) 3/8", (1) 1/2"