The K&M Primer Pocket Correction Tool uses a carbide cutter with a preset depth, ensuring you consistently square the primer pocket bottom. Uniform primer pockets will increase consistency and accuracy in reloads. This tool is made of steel with a carbide cutter. This can be used under power with a cordless screwdriver or with the K&M handle #698914 (sold separately). Large Rifle tool will cut primer pockets to a depth of .131". Large Pistol and the Small Rifle/Pistol tool will cut primer pockets to a depth of .122". Note: The intention of this tool is to uniform the primer pocket. It will not remove military primer crimps.