The Omnigrid 4” x36” folding ruler (R436F) offers full size functionality in a convenient folding design. Fully extended, the R436F is long enough to cut folded bolted fabric or trim finished quilt tops. Dual-sided markings make it great for left- or right-handed users. The 45 degree markings are handy for making long bias cuts. Fold it to store or travel. Omnigrid heavy-duty acrylic rulers have patented double sight lines, making the grid lines easy to see on light and dark fabrics. Made in the USA.