Matco Tools introduces an exclusive Bust-N-Out 3-Step Bolt Removal System, Nos. ZBEC5, ZBCD5 and ZBDR4. All three items are required to properly remove broken bolts or studs without damaging the original threads. These kits feature specialty-end cutting carbide burrs to be used in succession to Step 1 of the Bust-N-Out system, to properly locate a broken bolt center point. The kit prepares broken bolt surfaces for final drilling in the center of a broken bolt. The existing bolt hole provides a guide for burrs correct alignment to broken surface. Made for use with high-speed right angle grinders.