That was for information to get the connector sizes.....
5.5mm x 2.1mm / 2.5mm
I got two adapters - One 5.5mm and other 3.5mm. Unfortunately none of them would fit. 5.5mm too big and 3.5mm is too small. Am I missing something here? I tried to measure the size of hole and it seems more like 4mm. I have attached a photo. Can someone take a look and advise what adapter I should to buy? FYI. I need a power supply for Mecool M8S Pro L with a US plug. If you have a similar box, can you please tell me the adapter size? Thank you.