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For many years the MK Toughplug has been recognised as the standard audiophile-grade plug available at reasonable cost. It accepts a wide variety of cable thicknesses, but does need modifying internally to fit larger diameter wires.
Available here in the standard brass version, all contact pins and screws have been treated with Caig De-Oxit to chemically clean the plug contacts for better performance.
The MK Toughplug is also available in silver, gold and rhodium-plated versions.