'This connector fully complies with the IEC 62368-1 device standard, due to its component certification according to IEC 61984. 4-pole chassis connector, with size G round flange in black, countersunk holes, 3/4" flat lugs 16''.speakON panel mount connectors are the standard chassis connectors for speaker/amplifier interconnections. They feature a unique metal locking system, which establishes contact only when completely locked. speakON receptacles are robust, versatile and easy to terminate.'