Denali 12-Piece Masonry Hammer Drill Bit Set 12-Piece masonry bit set for drilling small diameter holes in masonry, concrete, and rock; these bits are intended for hammer drills Contains most commonly used drill bits High speed steel construction with carbide tips, round shank Sizes included: 1/8-inch (2), 5/32-inch (2), 3/16-inch (2), 7/32-inch (2), 1/4-inch (2), 5/16-inch (2) High-impact, rubber-reinforced case with sliding latch