This multi-purpose House ruler is designed to cut a multitude of shapes. Half-square triangles; quarter-square triangles, trapezoids; parallelograms; diamonds from squares and recctangles; house shapes; and barn shapes are fast easy and accurate to cut with this one ruler. The ruler slides easily over the fabric until pressure is applied. Then, the exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts! It comes with full illustrated step by step instructions.