Avanti Pro, 14 piece carbide tipped masonry drill bit set. Set consists of (3) 1/8", (2) 5/32", (3) 3/16", (3) 1/4", (1) 5/16", (1) 3/8", (1) 1/2". Avanti 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. Dual flutes remove dust and debris for cleaner holes. Avanti Pro masonry drill bits are only for use with drills in rotary mode.