The DEWALT® 5/8 In. x 22 In. x 27 In. 4 cutter spline shank rotary hammer bit has been tested on real world jobsites to ensure that it holds up and performs well under tough conditions. The rock carbide tip maximizes carbide surface contact so you can confidently drill anchor and through holes in concrete and other masonry. With a long helix four flute design that cleans out debris and an open head to channel dust into the flutes, drilling is fast, clean, and efficient even on repetitive drilling jobs. With tools that meet your standards, DEWALT® has your back.