NEF30 type control buttons with metal bodies are designed to be built into the standardized Ø30, 5 mm holes made in consoles, control and signaling boards or directly in the bodies of machines and devices. The NEF30 type buttons have a modular structure. Each push-button consists of: a drive element called the push-button drive a switching element consisting of one, two or three connectors attached to the drive. The NEF30 pushbuttons are mounted using fastening nuts, without the need to separate the drive and connectors.