The Omnigrip 3.5in x 12.5in ruler is used to cut strips, shapes and bias pieces when quilting; it is particularly handy for secondary cutting after cutting strips, and it can also be used to cut fat quarters into strips and shapes. Omnigrip rectangle rulers are used for a variety of sewing and fabric craft projects. Use with a rotary cutter or a straight-edge blade. Patented non-slip backing to hold ruler in place during cutting.