Pantheon Arms Castle Nut Tool Black Oxide. This Gunsmithing Tools from Pantheon Arms is machined to fit the Dolos castle nut precisely. The Pantheon Arms Castle Nut Installer is compatible with 3/8 inch drive ratchets or torque wrenches. For a more accurate installation of a Dolos kit or when you need to make multiple intalls use the Pantheon Arms Castle Nut Wrench Tool. Specifications for Pantheon Arms Castle Nut Tool: Manufacturer: Pantheon Arms Size: One Size Fabric/Material: Steel Color: Black Condition: New Length: 3/8 in Finish: Oxide Features of Pantheon Arms Castle Nut Tool CNT: Can be used with 3/8 inch drive ratchets or torque wrenches. Designed to fits Dolos castle nuts. Helpful for multiple installations or armorers. Allows faster barrel exchanges. Makes weapon clearing and cleaning easier. Package Contents: Pantheon Arms Castle Nut Installer CNT Pantheon Arms CNT: Castle Nut Tool Black Oxide