Cal Test Electronics CT4006 High Voltage 4mm Sheathed Banana Jacks operate up to 5kV when used in non-category environments with up to 2kV transient overvoltages. These banana jacks should be used only with the CT3018 or CT3020 long-reach high-voltage test leads. The CT4006 banana jacks are 1000V CAT IV rated and provide a ø2mm solder cup termination for soldering to a wire. The CT4006 banana jacks fit into plastic and metal panels fixed with a 14.5mm hex panel nut and are available in red or black.