https://www.dickblick.com/products/alvin-folding-parallel-ruler/
Alvin Folding Parallel Ruler | BLICK Art Materials
Create parallel lines quickly and accurately with the Alvin Folding Parallel Ruler. Each of the transparent blades measure 12 inches in length and have sturdy...
parallel rulerblick artalvinfoldingmaterials
https://www.dickblick.com/items/blick-portable-tabletop-drafting-board-with-parallel-ruler-straight-edge-23-x-31/
Blick Portable Tabletop Drafting Board with Parallel Ruler Straight Edge - 23" x 31" | BLICK Art...
Shop Blick Portable Tabletop Drafting Board with Parallel Ruler Straight Edge - 23" x 31" at Blick. Find everything you need for your next creative project...