Was looking for a 100x100mm wooden gatepost yesterday, and ended up buying
something called a Decking Pergola Post (because it had a smooth finish with
rounded edges, and it was cheaper).

This was only 90x90mm, but it still seemed quite light, and the guy in B&Q
managed to cut off one end with a handsaw in about half a minute.

Is there something special about these posts (like the sort of wood they
use), or will it do the job (as a gatepost) just as effectively?

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Bartc