Latest NTE5C MK2 master socket with BT Openreach branding printed on the top left corner. By simply unclipping the front plate the "test socket" is revealed for easy fault diagnosis. Cam lock connectors (tool less IDC!) on the rear connect to the incoming phone line, cam lock connectors on the front allow the end user to easily connect internal telephone extension wiring. The NTE5C MK2 is the latest type of socket that BT Openreach currently install, supplied as three pieces (22mm rear back box, rear plate with test socket and front lower plate). Dimensions (L) 85mm x (W) 85mm x (H) 35.5mm. No tools are required for the wiring (tool-less IDC connectors).