Diablo PMAPC1070-S14 Avanti Pro Carbide Tipped Masonry Drill Bit SetAvanti Pro masonry drill bits provide top quality performance when drilling into brick or block. This range features a carbide tip for extra durability and longer life in tough applications. Highlights: 14 Piece Set consists of (3) 1 8 inch, (2) 5 32 inch, (3) 3 16 inch, (3) 1 4 inch, (1) 5 16 inch, (1) 3 8 inch, (1) 1 2 inch Dual flutes remove dust and debris for cleaner holes Avanti Pro masonry drill bits are only for use with drills in rotary mode