~Trimmer D~ Trims in THREE-QUARTER INCH increments from 1.75" to 7.75". Purple print for easy identification from original trimmers. 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 7 sizes. Other uses include: squaring-up hourglass blocks; strip piecing hst; & strip/tube method of block construction.