September 2011- The Hole Enlarging Pilot System uses 2-in. D.O.C. Rotabroach cutters and portable magnetic drills to enlarge existing holes. The system is a two-piece assembly consisting of a threaded pilot and three differently sized screw-on nosepieces. Using a portable magnetic drill, the cutter and pilot are inserted into an existing hole. Then by re-drilling the hole, its diameter increases by 1⁄8 in.