Neutrik 4 pole chassis connector, black D-size flange, countersunk thru holes, 3/16 inch flat tabs The state-of-the-art chassis connector for loudspeaker / amplifier applications. They feature a unique locking system, robust plastic housing and high current silver plated contacts. Features Standard current rating 30 Amp High current version up to 50 Amp audio current Glass reinforced materials make it extremely robust and dependable Precise keyway for secure mating Accurate twist lock latching system Metal insert in locking area Airtight design - optimized for speaker applications