1/4" Stereo Female to 3.5mm Stereo Male Adapter

3.5mm Stereo Plug (male) to 6.35mm (1/4 Inch) Stereo Jack (female) Adaptor - Gold Plated

NOTE:  The 3.5mm male end is very thin compared to the 1/4" plug that will go in the other end, so this is not a good solution if there will be much flexing of the adapter on the 3.5mm end.   This is a good solution for situations where the adapter doesn't move much.