Finally a tool that simplifies the construction of the Diamond Square unit without having to use paper foundation piecing.?The Square Squared?(Square2) is an all-in-one tool that gives you a window template for accurately cutting the center square, a chart printed right on the ruler for the recommended size to cut the triangles sewn to the four sides of the center square and a trim down section on the ruler that simplifies the alignment of ruler to fabric unit and allows everyone to clean up the unit to a precise measurement every time. You can see the tool demonstrated on our?free online video demonstration?(see below, also on YouTube). This unit is a tricky one to get accurate, but with the Square?Squared?tool and technique of oversizing and trimming down you?ll have far better success than with any other product on the market.