RuiLing 2PCS High Quality 1/4" (6.35mm) Male to 1/8" (3.5mm) Female Adapter Metal - 3.5mm Stereo Plug to 6.35mm (1/4 Inch) Stereo Jack Adaptor.(Metal/Silver) 2-Pack Metal 6.35mm (1/4 Inch) Stereo Plug (male) to 3.5mm Stereo Jack (female) Adaptor - Silver Connect audio devices such as amplifiers and AV receivers to MP3 Players or smartphones with 3.5mm socket Silver resists corrosion and ensures minimal signal loss Allows you Connect headphones to audio devices such as amplifiers or AV receivers with 6.35mm socket. 360 degree grip treads help easy plugging and unplugging