I wanted a radius gauge / template that I liked the looks of… Couldn't find one, designed my own. 

• You can use it to draw rounded corners that are SQUARE (0 radius - ha ha fooled you, not rounded) 
• Draw 2 to 8mm (in 1mm increments) rounded corners.
• Measure rounded corners (both inside and outside)
• Measure circumference of round objects with a diameter of 5 to 10mm (again, in 1mm increments)
• The inner circles step down from 25 to 5mm radius in 5mm steps 
• The larger curve between the points of the star has a 26mm radius…
• You can also measure M2, M3 and M4 bolts/screws
• It has markings for 90 and 45 degree angles… 

It's the multi-tool of templates! Also I had nothing better to do and Printables had a drawing template contest on… And as a bonus, it's the PERFECT size coaster for your coffee cup!