6.35mm (quarter inch) adapters are typically used for microphones and professional audio equipment. All of our quarter inch adapters are made to convert various signals from what they are into the quarter inch or the other way around. This allows you to take your professional microphone and hook it up to your desktop computer or take your normal headphones and hook them up to your keyboard or guitar. Each adapter is made from quality materials and designed to meet all industry standards. Plus, you get a great price and a lifetime warranty.