The Deltron 550/551 series offers premium 4mm single-pole plugs and panel-mounting sockets, ensuring reliable performance. Crafted with silver-plated brass contacts, these plugs are designed for superior conductivity, featuring a solder bucket connection and a robust stainless steel contact spring. The plugs have a durable moulded acetal barrel, while the sockets are also made from tough acetal and include a solder bucket connection. The panel cutout size is 8.1mm, and both the plugs and sockets are rated for 10A, making them ideal for various applications.