Quilters Select Non-Slip Ruler 18in x 18in Large Square Block Ruler

The Quilters Select Non-Slip Ruler 18" x 18" is the largest square ruler in the QS line — essential for squaring up large quilt blocks, trimming backing fabric, and any task where a large flat square reference is needed. At 18", it accommodates blocks up to 17.5" finished (18" unfinished) in a single placement.

Frequently Asked Questions

What blocks require the 18" square?

16" finished blocks (16.5" unfinished), 17" finished blocks (17.5" unfinished), and any oversized block trimming task where the 10.5" square would be too small. Also useful for squaring up large quilt units before assembly.

Is the 18" square necessary if I have the 10.5" square?

For blocks larger than 10.5", yes — the 18" square is the only QS ruler that handles the largest standard block sizes. The 10.5" and 18" squares complement each other across the full range of block squaring tasks.

Can the 18" square be used for backing fabric preparation?

Yes — an 18" square makes an excellent reference tool for squaring up large backing fabric sections and checking that backing pieces are cut accurately on grain.

Is the non-slip coating effective at 18"?

Yes — same non-slip system as all QS rulers. At 18", the larger contact surface with the mat actually provides even more grip than smaller rulers.

What complements the 18" square in a complete QS set?

The 6" x 24" for strip cutting, the 6" x 12" for general cutting, and the 10.5" square for medium blocks round out a comprehensive QS ruler set.