6.35mm to 3.5 Jack 1/4" Male to 1/8" Female 3 Poles Stereo Headphone Plug Converter. USC C to Dual 6.35mm 1/4" Stereo Y Splitter DAC Audio Cable | Male to Male | 1m. This plug adapter allows you to easily convert a 6.35mm male socket into a 3.5mm female plug.
eBay