DEWALT DW5816-7/8-Inch By 16-Inch By 21-1/2-Inch 4-Cutter SDS Max Rotary Hammer BitThe DEWALT 7 8 In. x 16 In. x 21 1 2 In. 4 cutter SDS max 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, and a hardened core reduces breakage, so you can work confidently knowing that this hammer bit is built to last. With a U flute design that cleans out debris and an open head to channel dust into the flutes,