This 45 Degree Diamond template set (4 templates) is sized to work nicely with 10-inch pre-cut squares. Using the Slit N’ Slew method, it’s easier than ever to cut fabric. This method slits cut pieces for easy an perfect alignment during piecing – each and every time. No tedious pinning or paper piecing saving lots of time and effort! Can be performed by all quilters, from novice to expert!