Sink waste replacement

[Jeremya]

Hi I need to replace the waste in a bathroom sink but am having a problem finding a spanner to undo the hex nut which screws up to the underside of the sink and to undo the large hex not which connects the waste to the waste pipe. Any clues as to what I should be looking for?

Thanks

 

[Maxsys]

Probably something like these http://www.toolstation.com/shop/Hand+Tools/Pliers/Waterpump+Pliers+300mm/d10/sd60/p63642

 

[Dan Robinson]

Or a strong grip.

 

[bathjobby]

edit; blanked.