Helix Circle Ruler

Helix - 2-in-1 Ruler - Integrated Circle Templates - Innovative Learning Tool...

3 in 1 Ruler and Compass for Kids Draw Circles Up to 12 Inches with Graduations

12 in White Plastic Ruler 12 in length with 1/16 graduations

Helix - 2-in-1 Ruler - Integrated Circle Templates - Innovative Learning Tool...

- Machinist Ruler, 6 Inch, 2 Pack, Stainless Steel with Inch mm Graduations,...

Helix - 2-in-1 Ruler - Integrated Circle Templates - Innovative Learning Tool...

Portable Precision Compass for Artists - Metal, Adjustable for Accurate Circles