The compass has automatic lead core and pen clip. Automatic lead core type, press out core, no need to adjust, easy to use. Any pen can be clamped and the position can be customized. The compass has smooth lines and accurate drawing. It supports transparent square design, which makes it easier to identify right angles.

The utility model is characterized in that one side of the pen body is pasted and connected to one side of the folded leaf, the other side of the folded leaf is pasted and connected to the middle of one end of the ruler, the two sides of the upper end of the pen body are inserted and connected to both ends of the rotary shaft, and the shaft body of the rotary shaft is sleeved and connected to the upper end of the compass leg.