conductivity: BNC female plug with brass inner for electrical conductivity. The double tail hole accepts a 4 mm banana plug. Durable adapter: ABS insulation housing and brass plated main body for long service life. Wide compatibility and applications: widely used in electronic equipment, industrial equipment, inverters, welding machinery, charging generators, ships, RVs, trucks, automobiles, separation and distribution of solar cells, hardware, electronics, electrical appliances, computers, power regulators, game consoles, tape recorders, and various communication products. Main features: manufactured with precision technology; provides a strong connection, reliable conductivity, and working performance. Use scenarios: Use in lab measurement and test setups where a BNC connection needs to interface with 4 mm banana plugs. Suitable for solar power distribution, inverters, charging generators, and related power systems in ships, RVs, trucks, and automobiles. Appropriate for electronic equipment, computers, game consoles, tape recorders, and other devices requiring robust BNC to banana connections.