Made in the USA with high quality acrylic and precision measurements ensuring accuracy for your quilting, sewing, patchwork, and crafting projects. Creative Grids exclusive non-slip grip allows you to easily slide the ruler over the fabric until positioned correctly. Then, when slight pressure is applied, the grip holds the ruler in place, eliminating slipping while you cut. Use the vertical line to fussy-cut stripes and to cut half-square triangles. 1/4in seam allowance is clearly marked down the middle of the ruler. Horizontal lines are marked every 1/4in for maximum size options. Comes with fully illustrated step by step instructions. Scan the QR Code printed on the instructions to view a how-to video and to see the patterns that can be made with this ruler. Total Size – 8-1/2in x 17in Use this 90 degree triangle ruler, designed by Rachel Cross for Creative Grids, to cut quarter-square triangles from strips up to 8-1/2in wide. Sew four of them together to make a block up to 16in finished size.