What size box spanner would remove this backnut?

29 Sep 2015
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United Kingdom
I'd like to buy an individual box spanner rather than a set of them to remove this backnut from a small bathroom basin. What size box spanner would do the job?


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Hard to judge but looking at other items to get a scale of things, I’d say 17mm. Won’t an ordinary 17mm spanner fit on it?
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Ah, I was looking at the wrong nuts! I think the one single brass nut is 11 or 12 mm. As S666 says, that set would be cheap enough to do what you want.

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