SDS-Plus Carbide-Tipped Masonry Core Bit, 1 in. Diameter, For SDS-Plus Rotary Hammers, Asymmetrical Carbide Teeth for Up to 20% Faster Drilling, Centering Bit for Easy Hole Alignment and Precise Spot Drilling, Spiral Core Body Minimizes Friction and Aids Dust Removal, Two-Piece Design for Maximum Versatility, Ideal for Drilling Through Holes in Brick, Block, and Concrete.