Liquidraw Rolling Ruler 30cm Protractor Metric Parallel Line Architect
AA Rolling Parallel Ruler - Sam Flax Atlanta
Amazon.co.uk: Roller Ruler
Parallel Glider - John Neal Books
How to Use a Parallel Glider for Calligraphy and Lettering | Ever wondered how to use one of these nifty devices? They can save so much time! Find one in the TPK