?? Component outline and nut are made of environmental material PER, more durable and study comparing with other material in the market. ?? This fiber optic quick fast cable adapter with standard three-ring core, more stable and faster. ?? This connector has high return loss and low insertion loss, stable and reliable performance. ?? This connector adapter satisfies the international export standard, the connection rate is high. ?? Widely used in optical fiber transmission lines, optical fiber distribution racks and optical fiber testing equipment, etc.