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<< ADAPTER PLUG Stereo Headphone Jack 1/8" to 1/4" (3.5 mm to 6.3 mm) >>
Gold plated stereo plug. For the best electrical connection and No oxidation problems always use gold-plated connectors.
It was invented for use in telephone switchboards in the 19th century and is still widely used today all over for many thing.
A TRS connector, also called an audio jack, phone plug, jack plug, stereo plug, mini-jack, or mini-stereo, is a common audio connector. It is cylindrical in shape, with three contacts.
With a small female (1/8") headphone plug to be a large male (1/4") - (3.5mm to 6.3mm)
1/8" TRS (Stereo) Jack to 1/4" TRS (Stereo) Plug Adapter
High quality design.
Look at the ends on the photo!