Universal Grounded Type-B Plug Adapter For USA/Canada - Travel Essential - 1 Pack, White Review

The ground prong is a rarity among UK to US travel adapters available in the US. If you need to plug in your UK device don't risk not having the ground prong. In my case it was an Apple Thunderbolt monitor that needed to 'see' the unit was properly grounded before I could convert the cable to the US one. Silly Apple and their smart people.

sits tightly enough in the outlet, due to the fact that the adapter is flat, there is almost a complete feeling that this is just a socket, i.e. does not protrude much and the plug does not pull the adapter down.

As you can see in my uploaded video, the metal part are not straight and difficult to insert in the outlet. it functions well but the structure isn't as good as the others. I chose this brand because it was description says 10 to 16A but actual product has mark only 10A.