What is a diamond art ruler used for?

It straightens rows of drills. Slide its edge along a line to push stray drills back into place and close small gaps, which matters most with square drills that sit edge to edge.

Do it as you go, while the glue is still fresh. Our alignment ruler and tray measures 14 × 10 cm and does not stick to the canvas. See our alignment guide for the full method.