HUASEN 6.35mm Adapter Converter 2 Pack 3.5mm (1/8 inch) Female to 6.35mm (1/4 inch) Jack Male Stereo Audio HUASEN audio jack adapter converts a commercially available jack cable with a 3.5mm plug into a 6.3mm plug. Thus, you can easily connect your headphones to audio devices with 6.3 mm jacks such as hi-fi systems. The adapter has been precisely and accurately machined and provides a secure, tight fit in the port to eliminate transmission errors caused by camera shake.