COSMOS Set of 2 Headphone Adapter / Microphone Converter Plug - 3.5mm stereo male to 6.3mm (1/4 Inch) stereo female adapter PLUS 6.3mm (1/4 inch) male to 3.5 mm female stereo adapter Each pack contains 2 different headphone / stereo adapters Adapter 1: 6.5mm (1/4 inch) male to 3.5mm (1/8 inch) female Audio Adapter Adapter 2: 3.5mm (1/8 inch) male to 6.5mm (1/4 inch) female Audio Adapter Connect headphones to audio devices such as amplifiers or AV receivers with 3.5mm / 6.35mm socket Both adapters with 360 degree grip treads help easy plugging and unplugging