The SEW EASY 90° triangle ruler is a large measuring guide for quilters and patchworkers who want consistent angled layouts without tracing templates. Ruler size is 190 x 394 mm (7 1/2 x 15 1/2 in), providing a long edge for aligning fabric, checking angles, and marking triangle shapes before cutting. Use it to measure, mark, and plan repeatable triangle-based patchwork pieces, especially when building on-point blocks across a full quilt top.