Cal Test Electronics CT4407 4mm Sheathed Banana Jacks provide a ø2mm solder cup with a slot for the connection. These banana plugs have a 1000V CAT IV rating and operate up to 5kV when used in non-category environments with transient overvoltages up to 2kV. These banana plugs are designed to be used only with the CT3018 or CT3020 long-reach high-voltage test leads. The CT4407 banana jacks fit into plastic and metal panels fixed with a 14.5mm hex panel nut and are available in red and black color options.