Multi-Function Drawing Tool, EDC Stationery Multifunction Scale Ruler, Versatile Circle Drawing Tool for Designers Architects Artists StudentUNIQUE DESIGN: An innovative pocket-sized drawing tool for designers, artists, architects, periodical enthusiasts, mandala enthusiasts, illustrators, tattoo artists, students and creative professionals.STABLE ENOUGH : It doesn't go through the holes in the paper because it doesn't have sharp points, and although it has a specially designed rolling base, it's still stable enough not to move around.VERSATILE : Not only can it be used as a straight and curved metal ruler, it is also used as a compass and protractor.You will be able to draw perfect circles and patterns effortlesslyDIVERSIFICATION : It is a highly portable multi-purpose stationery that functions like traditional compass technology.The isn’t just a stationery tool, it’s a real tool too. It packs a pen-stand, rounder/compass, wrench, scale, bottle opener, and drawing guide all in one.FOR CONVENIENCE : In order to be portable stationery, we designed it specifically for convenience, and it can be placed in a notepad like a glove.How to use it?1. mark center on the paper2. put the compass in top3. start at 360 degree for the starting point4. rotate and draw an arc5. stop drawing when you have the angle you want6. finally, draw two straight lines to get radius and angle