A2 ~ LARGER SIZE~ Squares up to 10.5" blocks in half-inch increments. An easy, efficient and accurate way to trim half-square triangles. Align the seam of an unpressed hst with the dashed lines and with 2 easy strokes, trim all four sides. The exclusive edge slots allow for trimming dog ears at the same time. There's no need to rotate and realign fabric. Trims up to 6 slotted sizes: 5.5" to 10.5" (Ten half-inch sizes). This larger ruler is for trimming half-inch sizes only. Other uses include: squaring-up hourglass blocks; strip piecing hst; strip/tube method of block construction; and fussy cutting.