Since the tip is trimmed, all squares and triangles can be cut from the same strip of fabric. A 1/4 inch dashed line is printed on each side of the center vertical line so you can cut 45 degree triangles that include the seam allowance. A dashed 1/4 inch seam allowance is printed around the entire edge of the ruler. The ruler slides easily over the fabric until pressure is applied. Then, our exclusive for gripper holds the fabric in place while cutting, eliminating slipping and miss-cuts Create half-square triangles (HST) in multiple sizes using the same tool. Whichever the pattern you choose can be completed with this ruler. Specification: Use: for Patchwork Quilting Material: Acrylic Shape: Half-Square /90 Degree for Triangle Four different ways to sew in HST: 1x Quilting Ruler Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping Specifications: Use: for Patchwork Quilting Material: Acrylic Shape: Half-Square /90 Degree for Triangle Four different ways to sew in HST: 1 - Create eight half-square triangles out of a set of squares. 2 - Cut ready to sew sets of triangles from strips. 3 - Mark and Sew 1/4 inch seam lines. 4 - Trim over-sized HST's to the correct size. Choose the method that works best for you. Size: Small: 21.53x11.42cm/8.48x4.50 inch Big: 23.34x12.26cm/9.19x4.83 inch Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping Package included: 1x Quilting Ruler