Premium Skip-Proof Spotweld Cutter for removing spotwelds quick and easy. Pilot drill helps keep the pilot from skipping off the cutting surface. Thick wall for extreme durability and a two step tooth geometry which splits the chips and helps to clear them. For use in 3/8" or larger drill chucks. Includes 3/8" Rotabroach cutter (11108-3), arbor (11123), and pilot (11097). Made in USA. Cutter RPM should not exceed 500 RPM.