The SEW EASY half diamond ruler is a specialty measuring template for quilters and patchworkers building geometric patchwork with angled edges and repeated shapes. Ruler size is 114 x 362 mm (4 1/2 x 14 1/4 in), giving a stable long edge for aligning fabric and marking consistent diamond-style cuts across strips. Keep it with your cutting tools to speed up layout work when patterns call for matching angles, clean points, and uniform piece sizing.