These Long 20m jack leads have a 6.35mm plug and a to 3.5mm jack plug, This enables users to connect between audio equipment,  The lead is bi-directional and can be used to connect from a mono 6.35mm device into a 3.5mm mono connection or vice versa, they can be used to connect between audio equipment that may have different jack inputs / outputs,  
For 3.5mm Jack Plug to 6.3mm (1/4inch) Jack Plug audio equipment.
Gold flashed contacts for better connection and anti-corrosion properties.
•    6.35mm to 3.5mm Jack Cable 
•    6.35mm Jack Male 
•    3.5mm Jack Male
•    Mono Audio
•    Gold Connectors
•    Length 20 Metre
SKU: CA-HQCP-016
SKU - CA-PSG02749 3.5mm to 6.35mm Headphone adaptor