This is a pair of 4mm lantern style gold-plated banana plugs, paired with red and black colors, which are commonly used wiring terminals in the fields of electronics and audio. 1、 Structural disassembly Front metal plug-in rod Made of brass gold-plated material, with a multi petal lantern opening structure: After inserting into a 4mm standard banana socket, it will tighten elastically, with tight contact and stable conductivity; The gold plating layer is resistant to oxidation, has low impedance, and is not easily heated under high current; The spherical end plug is inserted and removed smoothly without damaging the socket. Insulated casing (red/black) Hard insulating plastic, with red representing the positive pole and black representing the negative pole, is used to distinguish the polarity of the circuit and prevent short circuits or reverse connections between the positive and negative poles. Side fixing hole The hole contains fastening screws, which belong to the welding free design: Peel off the outer skin of the speaker and power cables, insert them through the tail of the plug, tighten the side screws to firmly clamp the wires, and ordinary people can quickly connect them without using an electric soldering iron. 2、 Core purpose Audio speakers (most commonly used) The speaker cable connectors for amplifiers, HiFi speakers, and home theaters distinguish left and right channels/positive and negative poles in red and black, making it easy to quickly plug and remove audio equipment. Electrical experiment/testing equipment The testing wires for DC stabilized power supplies, multimeters, teaching experimental platforms, oscilloscopes, and other instruments have a standardized 4mm interface in the industry, with strong universality. Model, high-power DIY circuit High current connection wires for model aircraft, batteries, high-power LEDs, and DC equipment. 3、 Product advantages Welding free screw fastening, easy installation; Gold plated copper core, good conductivity, durable and not easily oxidized or blackened; Standardization of red and black color separation, making circuit polarity clear at a glance; The globally universal 4mm specification can be matched with almost all banana sockets; Insulated casing isolates leakage, making it safer to use.