WANTOUTH 5 PCS Geometry Set 4 Pcs Aluminum Metal Scale Ruler Set Triangle Ruler Square Protractor Set Architect Scale Ruler Set + 1 Pcs Professional Compass Maths for Architects Engineers Students

●[Durable Metal Compass] These compass sets are made of high quality metal, iron and aluminum, which are stronger and more durable than plastic compasses. The surface is also sprayed with plastic, which is beautiful and fashionable while preventing rust and corrosion ●[Adjustment function] The geometry compass has a center wheel adjustment function (consisting of an elastic metal ring on the head, a center shaft and a center wheel). By rolling the center wheel, the diameter of the circle can be finely adjusted, which makes drawing easy and interesting ●[Stability when drawing circles] The precision drawing compass has a spring chuck and a center wheel to prevent unnecessary leg movements. In addition, the grooved compass head ensures a firm, non-slip grip that is not easy to slip off. You can use our drawing metal compass for stable circle drawing work. ●[Easy to use] The quick adjustment compass is easy to use. You can make fine adjustments using the central drive wheel, or you can hold the compass and click the adjustable wheel to set the circle diameter quickly and accurately. ●[Widely Used] Our precision drawing compass is suitable for school, carpentry, workshop or home use, and is very good for students, teachers, artists, architects, mathematicians, engineers, woodworkers and carpenters to carry out drawings and drawing projects. Dear customer, please look at the size before buying，thanks！