On list is one pair of Taiwan-made RCA audio socket for panel mounting. The socket body is machined from solid copper/brass which differentiates its built quality from low-cost sheet metal connectors . The sockets are well polished and gold-plated to give a reflective, glossy surface. The built quality can be shown in the pictures. Thread diameter : 8mm . Recommended hole size : 9mm - 10mm. Recommended panel thickness : smaller than or equal to 3mm. Shipping cost is US$4.00 worldwide. We welcome combined shipping.