Ball Mount - Tough-Mag™ - 66 mm - Looking to mount to a metal surface? The RAM® Tough-Mag™ base is the powerful and durable solution you’ve been searching for - With a B size ball screwed into a ¼-20” threaded post, simply attach a compatible double socket arm and your desired RAM® device holder - This base features an industrial-strength N35 grade magnet and rubber coating that protects the metal surface you’re attaching the RAM® Tough-Mag™ to