Can you identify this cable ?

[V8covin]

Can you tell from the photo was size this plug is ?

https://www.amazon.co.uk/Conbrov-Extension-Connect...

I'm looking to buy an extension cable the same as this but shorter and cheaper and found this one on Ebay but can't be sure it's the same.

http://www.ebay.co.uk/itm/like/1M-White-Female-To-...

Cheers

[V8covin]

Am I right in thinking 2.1mm is the internal diameter of the male end ?

[V8covin]

Cheers.Looks like I'll have to get my verniers out and measure