When measuring the diameter of the plug hole, the hole diameter was small about 0.3 mm, but the center pin of the insertion part on the monitor side did not enter and could not be used as it was. I used to replace the plug on the adapter side with the one of the adapter that broke down.
It seems that the adapter cable of the portable DVD TV being used has broken, so I thought it was cheaper than maker repair and purchased it. However, it was a mistake that I thought that if the power jack shape is a 12 V adapter. Jack of this product is a type without core in the middle. What I wanted is a type with a core in the middle. Therefore, we use the jack of the broken adapter and the jack of this product to change. I hope I had some pictures of Jack's shape. I am using it by remodeling, but there was not any problem. The cable length of the adapter got longer, I used it in a car inverter, but it got better by now.