Shop for Power Tool Accessories at The Home Depot. The Dewalt 7/8 in. x 16 in. 2 Cutter Spline Shank Rotary Hammer Bit can be used with a spline rotary hammer to help drill anchor holes in masonry. Designed with an open head and a U-Flute for quick and easy drilling. This hammer bit has a rock carbide tip for reliable usage.