Folded Corners Ruler. Designed for Miniature Enthusiast! Use for base fabrics that are smaller than 4-1/2in (what you will be adding a folded corner to). Use with any pattern calling for folded corners. Remarkably accurate! Never draw a line for folded corners again! Seven different sizes to choose from, 1/2in to 3-1/2in finished folded corner. Choose between two methods: exact size folded corners with no trimming needed OR oversize folded corners that are trimmed down. Easy to read ruler. No matter what shape you are adding a folded corner to (square, rectangular, triangle), Simple Folded Corners ruler can add them with ease! Step by step instructions included with the tool. Illustrations for both LEFT and RIGHT hand trimming.