Creative Grids Half Square 4-in-1 Triangle Quilting Ruler Template CGRBH1 Create half-square triangles (HST) in multiple sizes using the same tool using one of four methods Method #1 - Create eight half-square triangles out of a set of squares. Method #2 - Cut ready to sew sets of triangles from strips. Method #3 - Mark and Sew 1/4" seam lines. Method #4 - Trim Over-sized HST's to the correct size.