32A 240v/230v single phase plug to 63A 240v socket.
Uses 1m Black HO7 6mm 3 core.
This adapter cable should only be used by a suitably trained person, it is unsuitable for powering most 63 Amp appliances, as it could cause damage and / or trip the power supply.
These adapter cables are generally used for testing purposes or to power distribution boards from smaller supplies. You will not be able to use the full capacity of the board but it will work.
Do call if you need any advice.