This exclusive Singer Featherweight Shop Creative Grids Ruler measures 2 1/2" inches by 6 1/2 inches, and was designed by us to feature the little Singer Featherweight 221. This compact-sized grid ruler has become my go-to portable ruler for "quilting small" and is perfect to measure my scant 1/4 inch for perfectly accurate seams using the Featherweight Accurate Seam Guide. The grid ruler is also a nice size to stow away in my Singer Featherweight Case. One superior feature, exclusively by Creative Grids, is the underside of each ruler has several small texture circles strategically built-in and placed for easier fabric gripping -- and, the built-in grips don't obstruct viewing or measuring! Creative Grids is simply top-notch when it comes to holding steady while you cut!