The Milwaukee Big Hawg aggressive tooth geomerty drills 10 times faster than hole saws. The innovative 3 tooth design allows you to drill up to 600 holes without resharpening. the deep gullets and reduced pilot bit shank deliver easy plug removal saving you time and money. The Milwaukee Big Hawg hardened steel teeth provide maximum durability against unintended nail impacts. For use with wood and metal. Includes: (6) hole cutters: 2-1/8", 2-1/4", 2-9/16", 3", 3-5/8", 4-1/4", (1) arbor with pilot bit, (2) pilot bits, (1) diamond file, hex wrench, and carrying case.