For making LARGER size half square triangles; from 1.5 inches up to 10.5 inches; includes 6 slotted sizes between 5.5 inches to 10.5 inches Easy, Efficient & Accurate method to trim and square-up half-square triangles; INSTRUCTIONS ARE PRINTED on these quilting rulers, so you never have to look for instructions One alignment and two cuts trims all four sides of half-square triangles; Makes cutting quilt pieces significantly faster; Don’t need to rotate fabric when cutting Exclusive edge slots remove dog ears from fabric at the same time; makes the assembly of quilt blocks more accurate; See product description for additional uses This ruler is made from premium quality clear acrylic plastic; laser cut for a smooth clean edge and clearly printed grid lines for easy use for all levels of quilters The A2 trimmer is a ~LARGER~ version of the original Clearly Perfect Slotted Trimmers. This trimmer has all the same features as the original Trimmers but can be used for larger blocks. Squares up to 10.5" blocks in half-inch increments. Align the seam of an unpressed half-square triangle with the dashed lines and, with 2 easy strokes of your rotary cutter, trim all four sides. The exclusive edge slots allow for trimming dog ears at the same time saving you loads of time and more accurate blocks. There are 6 slots on the trimmer that allow you to trim dog ears with one alignment. These slots are for : 5.5”, 6,5”, 7.5”, 8.5”, 9.5” and 10.5” blocks. There's no need to rotate and realign fabric at any time during your cutting process. Other creative uses include: squaring-up hourglass blocks; strip piecing hst; strip/tube method of block construction; and fussy cutting. These rulers are manufactured by the top laser cutting technologies for accuracy and clearness that is second to none.