Carbide facing burr requires only hand tools to cut the bolt face square and concentric to the boltway. Saves man hours and setup time. Tooling block locates in the front receiver ring; turn the facing burr with a slow speed drill motor. Use after bolt lapping and squaring receiver face. SPECS: High speed steel, carbide cutter head. Fits Remington 700 receivers. Use requires Tooling Block and one Facing Burr.