The Mac Tools Burr Bolt Removal Kits, Nos. CBBR-KIT2 and CBBR-KIT5, aid in the removal of broken studs and aim to maximize the potential of drilling threads on the center. The removal kits reduce damage to existing threaded holes and are designed to save the threads and components. The kits are available as 5/16" or 1/2", each including a BR countersink, BR drill, and BR endcut bur. Each kit is CNC machined for consistent high quality.