The compass ruler set automatic lead core window opening model has a metal compass, a 15cm ruler, a protractor, a 45 ° right triangle ruler, a 60 ° right triangle ruler, an eraser and a box of 0.7 lead core. The compass is made of stainless steel metal, which is more durable, with smooth lines and accurate drawing. The maximum diameter can reach 290mm.

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.