What is the size of the laptop power socket?

The power interface is plugged into the computer, and the size, length, inner diameter, outer diameter and pins may be different, such as:

The outer diameter is 2.5MM, which is called "common mouth" in the industry;

Outside diameter 1.7MM, which is called "small mouth" in the industry;

Bullet shape; The outer diameter is 3.0MM, with a big needle mouth and a round needle mouth.