Simple Folded Corners Ruler - Antler Quilt Design AQDR1Ruler from Antler Quilt Designs. Make Accurate Folded Corners Every Time. Never draw a line for folded corners again! Choose between two methods: Oversized Folded Corner to Trim Down or No Trim Exact Size Folded Corners. 12 Different corner sizes. Contains instructions for both right and left handed users. Included is a free Flying Dutchman pattern.