The Cal Test Electronics CT2246B Banana Jack Panel Mount Wrench provides a convenient solution for 4 mm Sheathed Jacks on panel mounts. Crafted from durable stainless steel with a passivated finish, this wrench guarantees longevity and corrosion resistance.The upper tool securely holds the Sheathed jack in place, while the lower tool engages the panel nut, allowing for swift and effortless tightening. Plus, when not in use, the two pieces can be threaded together for convenient storage.