Schützinger Bench & Research and Development Accessories Jack socket 615159 - Schutzinger LB 4-RKS Ni / 8.4 / SW, The Schützinger LB 4-RKS Ni / 8.4 / SW jack socket is a black 4mm laboratory connector designed for safe and reliable connections. It is typically used in electrical and laboratory applications for secure and efficient signal transmission. As a safety jack socket, it is ideal for environments requiring robust and safe electrical connectivity. Schützinger LB 4-RKS Ni/8.4/SW Jack Socket Black 1pc