CHK Deb Tucker's Diamonds Rects Trim Ruler - UDT15Now you can make those tough elongated diamond units needed for any Storm at Sea project with ease and success. But remember, this is a basic unit that can combine with any of the other fundamental units to create many, many other interesting designs and quilt projects. You'll precision cut the center diamond, then sew on side triangles to create an oversized unit that you'll trim down to the perfect size.